Analyzing 6,495,9256.5M ReviewsFor 17,98218K Experts
We graded 9 companies on seven things customers actually report: satisfaction, reliability, workmanship, value, momentum, track record and how owners handle complaints.
From 19,508 Google reviews of 44 top-rated security system installers nationwide; 9 of them in Tustin, CA. Updated November 1, 2026.
Pick the job — we re-rank companies by how customers rated that exact job.
Experts Score 0–100Experts Score (0–100)Absolute quality first: recency-weighted star average (≈54%), share of 1–2★ reviews (≈24%), customers’ price verdicts (≈14%), owner replies to critical reviews (≈7%); minus up to 10 points each for complaints flagged in Google review highlights and for a real slide in recent ratings. Hover a company’s score on its page for the full breakdown. and a letter grade per factor (A = top 20% of security system installers).
| # | Company | ScoreExperts Score (0–100)Absolute quality first: recency-weighted star average (≈54%), share of 1–2★ reviews (≈24%), customers’ price verdicts (≈14%), owner replies to critical reviews (≈7%); minus up to 10 points each for complaints flagged in Google review highlights and for a real slide in recent ratings. Hover a company’s score on its page for the full breakdown. | FactorsFactor grades, in orderSatisfaction (54%): Recency-weighted star average (2-year half-life), shrunk toward the category mean by review volume; the company’s own lifetime average as the prior; absolute: 4.0★ = 0, 5★ = 100.Reliability (24%): How rarely jobs go badly: share of 1–2★ reviews — 60% the last 24 months (or the 20 newest if fewer), 40% all-time; 0% = 100, 15%+ = 0; the category percentile can only raise it.Craft & service (0%): Google review highlights: Quality, Professionalism, Responsiveness, Punctuality — how rarely reviewers flag them as a negative, per review since highlights began; 0% = 100, 5%+ = 0. Subtracted from the score (up to −10), never averaged in — clean highlights are the norm, not a bonus.Value (14%): Customers’ own price verdicts (Great / Reasonable vs Overpriced) and Value highlights; 65% absolute (all “reasonable” ≈ 80, “great” = 100), the category percentile can only raise it.Momentum (0%): Penalises only a real slide: last-12-month average below lifetime (−0.5★ = 0). Still 4.8★+ over the last year, or steady/improving = 100. Subtracted from the score (up to −10), never averaged in.Replies to reviews (7%): How often the owner publicly replies to reviews under 5★ (1–4★). Needs 3+ such reviews, otherwise not counted; 65% absolute (80%+ replied = 100), the category percentile can only raise it.One letter per factor score: A = 80+, B = 60–79, C = 40–59, D = 20–39, F = below 20. | ★Google star rating as shown on Google Maps. | Typical billMedian bill customers of this company reported in their reviews (needs 3+ priced reviews). |
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| 1 |  Burgi Technologies | Managed IT & CybersecurityTustin, CA | A 99How the Experts Score is calculatedEach factor is scored 0–100 on absolute terms (standing in the category can only raise it), then weighted; problems flagged in review highlights or a recent slide in ratings are subtracted:Satisfaction 69%100+69.2Reliability 31%98+30.2Experts Score= 99Not enough data for value, replies to reviews; its weight is shared by the others.Grade A: A = 80+, B = 60–79, C = 40–59, D = 20–39. Needs 10+ reviews. | AA––A– | 5.00 | — |
| 2 |  Modern Tech LLC - Security camerasTustin, CA | A 98How the Experts Score is calculatedEach factor is scored 0–100 on absolute terms (standing in the category can only raise it), then weighted; problems flagged in review highlights or a recent slide in ratings are subtracted:Satisfaction 59%98+57.5Reliability 26%96+25Value 15%100+15.2Experts Score= 98Not enough data for replies to reviews; its weight is shared by the others.Grade A: A = 80+, B = 60–79, C = 40–59, D = 20–39. Needs 10+ reviews. | AA–AA– | 5.00 | — |
| 3 |  Comlock Security GroupTustin, CA | A 97How the Experts Score is calculatedEach factor is scored 0–100 on absolute terms (standing in the category can only raise it), then weighted; problems flagged in review highlights or a recent slide in ratings are subtracted:Satisfaction 69%98+67.8Reliability 31%95+29.2Experts Score= 97Not enough data for value, replies to reviews; its weight is shared by the others.Grade A: A = 80+, B = 60–79, C = 40–59, D = 20–39. Needs 10+ reviews. | AA––A– | 4.95 | — |
| 4 |  DPS Security Services- Local ADT Authorized DealerTustin, CA | A 97How the Experts Score is calculatedEach factor is scored 0–100 on absolute terms (standing in the category can only raise it), then weighted; problems flagged in review highlights or a recent slide in ratings are subtracted:Satisfaction 59%98+57.5Reliability 26%96+25Value 15%96+14.6Craft & service penalty97−0.3Experts Score= 97Not enough data for replies to reviews; its weight is shared by the others.Grade A: A = 80+, B = 60–79, C = 40–59, D = 20–39. Needs 10+ reviews. | AAAAA– | 5.00 | — |
| 5 |  Digital Installers IncTustin, CA | A 97How the Experts Score is calculatedEach factor is scored 0–100 on absolute terms (standing in the category can only raise it), then weighted; problems flagged in review highlights or a recent slide in ratings are subtracted:Satisfaction 69%97+67.2Reliability 31%96+29.5Experts Score= 97Not enough data for value, replies to reviews; its weight is shared by the others.Grade A: A = 80+, B = 60–79, C = 40–59, D = 20–39. Needs 10+ reviews. | AA–––– | 5.00 | — |
| 6 |  Launch SystemsTustin, CA | A 94How the Experts Score is calculatedEach factor is scored 0–100 on absolute terms (standing in the category can only raise it), then weighted; problems flagged in review highlights or a recent slide in ratings are subtracted:Satisfaction 59%95+55.8Reliability 26%97+25.3Value 15%87+13.2Craft & service penalty98−0.2Experts Score= 94Not enough data for replies to reviews; its weight is shared by the others.Grade A: A = 80+, B = 60–79, C = 40–59, D = 20–39. Needs 10+ reviews. | AAAAA– | 4.96 | — |
| 7 | Alert 360 Home & Business Security Los AngelesTustin, CA | A 84How the Experts Score is calculatedEach factor is scored 0–100 on absolute terms (standing in the category can only raise it), then weighted; problems flagged in review highlights or a recent slide in ratings are subtracted:Satisfaction 64%90+57.2Reliability 28%82+23.2Replies to reviews 8%45+3.7Experts Score= 84Not enough data for value; its weight is shared by the others.Grade A: A = 80+, B = 60–79, C = 40–59, D = 20–39. Needs 10+ reviews. | AA––AC | 4.91 | — |
| 8 |  Smart Systems TechnologiesTustin, CA | B 79How the Experts Score is calculatedEach factor is scored 0–100 on absolute terms (standing in the category can only raise it), then weighted; problems flagged in review highlights or a recent slide in ratings are subtracted:Satisfaction 55%88+48Reliability 24%82+19.9Value 14%100+14.1Replies to reviews 7%24+1.7Craft & service penalty52−4.8Experts Score= 79Grade B: A = 80+, B = 60–79, C = 40–59, D = 20–39. Needs 10+ reviews. | AACAAD | 4.76 | — |
| 9 |  Tech Security USATustin, CA | C 50How the Experts Score is calculatedEach factor is scored 0–100 on absolute terms (standing in the category can only raise it), then weighted; problems flagged in review highlights or a recent slide in ratings are subtracted:Satisfaction 55%74+40.4Reliability 24%49+11.9Value 14%25+3.5Replies to reviews 7%26+1.8Craft & service penalty62−3.8Momentum penalty61−3.9Experts Score= 50Grade C: A = 80+, B = 60–79, C = 40–59, D = 20–39. Needs 10+ reviews. | BCBDBD | 4.85 | — |
What customers paid, from the price Google asks reviewers to report.
| Job | Low25th percentile: 1 in 4 customers paid less than this. | TypicalMedian of the bill customers reported in their Google review (Google asks reviewers for a price range; we use the middle of each range). | High75th percentile: 1 in 4 customers paid more than this. | FairOf customers who rated the price, the share who chose “Great price” or “Reasonable” rather than “Overpriced”. |
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How the 9 security system installers we rated in Tustin, CA compare, and what customers praise most.
A = score 80+, F = below 20.
Average stars per company.
Share of Google review highlights.
All price verdicts left with reviews.
Share calling it great / reasonable / overpriced.
Satisfaction (54%) — Recency-weighted star average (2-year half-life), shrunk toward the category mean by review volume; the company’s own lifetime average as the prior; absolute: 4.0★ = 0, 5★ = 100.
Reliability (24%) — How rarely jobs go badly: share of 1–2★ reviews — 60% the last 24 months (or the 20 newest if fewer), 40% all-time; 0% = 100, 15%+ = 0; the category percentile can only raise it.
Craft & service (penalty, up to −10) — Google review highlights: Quality, Professionalism, Responsiveness, Punctuality — how rarely reviewers flag them as a negative, per review since highlights began; 0% = 100, 5%+ = 0. Subtracted from the score (up to −10), never averaged in — clean highlights are the norm, not a bonus.
Value (14%) — Customers’ own price verdicts (Great / Reasonable vs Overpriced) and Value highlights; 65% absolute (all “reasonable” ≈ 80, “great” = 100), the category percentile can only raise it.
Momentum (penalty, up to −10) — Penalises only a real slide: last-12-month average below lifetime (−0.5★ = 0). Still 4.8★+ over the last year, or steady/improving = 100. Subtracted from the score (up to −10), never averaged in.
Replies to reviews (7%) — How often the owner publicly replies to reviews under 5★ (1–4★). Needs 3+ such reviews, otherwise not counted; 65% absolute (80%+ replied = 100), the category percentile can only raise it.
The 10 best-rated security system installers in Tustin, CA average 5.0★ on Google across 1,467 reviews. Comlock Security Group has the top rating (5.0★), and Alert 360 Home & Business Security Los Angeles has the most reviews (648). Updated October 28, 2026.
10 companies that meet our bar: rated 4.5★ or higher on Google, with a meaningful review history (1,467 reviews combined) and currently operating. Request a call back and the company will phone you directly.
“Scott at Alert360 is an excellent technician. He is prompt, knowledgeable, and consistently courteous. I have been very impressed with both Scott and Alert360. This is the third time he has visited our home over the…” — Google review
“I’ve been using this place many times for making keys and getting locks. Very professional and the pricing is perfect. I would say cheaper than your local warehouses.” — Google review
“Burgi has been handling our company's IT for a few years now, and they continue to do a fantastic job. Nathan Munoz just upgraded my workstation quickly and flawlessly, and I'm back up and completely running with no…” — Google review
“Marco is definitely a guy that’s a dime a dozen. I’m an IT Generalist specializing in Systems and Networking. I’ve had some trouble with an Access Control system and he walked in, took a look, figured what was wrong…” — Google review
“Tech Security USA provided excellent service! I’m very happy with my experience and truly appreciate their help. highly recommended!” — Google review
“Excellent “white glove” service from Al. He checked all 5 of our smart home systems, helped identify the correct app to download, and made sure the apps were working correctly on our phones. His patience is amazing…” — Google review
“Chaz helped me get set up and familiar with the preexisting system in the home we just bought. He gave clear direction, he was patient and helpful. He made sure we understood everything before he left and said to…” — Google review
“Terrific service - highly recommend. Timely, clean, expert guidance, fair and affordable pricing. Took care of our home as if it was their own. Shout out to Miguel for above and beyond service - thank you!” — Google review
“State of the art technology combined with outstanding customer service provides a superior consumer experience. Shaun and Seth have taken care of all of our audio visual upgrades and consultations in a most caring…” — Google review
“I had a great experience with Mordern. They are extremely professional and knowledgeable when it comes to security cameras and surveillance systems. The quality of their work was excellent, and they took the time to…” — Google review
We scan Google Maps for security system installer listings in and around Tustin, keep only open businesses whose main category matches the service, and require a Google rating of at least 4.5 from at least 20 reviews. Companies are ordered by a confidence-weighted score that balances rating and review volume. We do not accept payment for placement.
Comlock Security Group has the highest Google rating on our Tustin list: 5.0 out of 5 from 83 reviews (as of October 28, 2026).
Alert 360 Home & Business Security Los Angeles has the most Google reviews among the companies listed here: 648, with a 4.9★ average.
Only open Tustin-area businesses whose Google category matches the service, rated at least 4.5★ from at least 20 Google reviews. They are ordered by a confidence-weighted score of rating and review volume. Placement is never paid.
Analyzing 6,495,9256.5M ReviewsFor 17,98218K Experts