I've seen a couple of reviews on here and decided to leave one. When I bought my 1st house, it had a alarm system from Sears. I like the system, but as always, Sears did not provide the protection service, this was provided by Monitronics. Always responded quick if alarm went off. When I moved my new house had ADT system installed. I changed to them. After the alarm went off twice and I never received any calls for almost 5 minutes, or later, I cancelled them, and called Monitronics to come and change the system over. Since then, I have had nothing but excellent service (16 years now). If my alarm goes off, I get a call within 2 minutes, or sooner. If I have a problem, or need to change something, they are here within 1 or 2 days. Nothing but praise for them. With changes in the security systems, and updates in whats available, they contacted me about upgrades, came out, upgraded and was very nice. After upgrades, couple of more upgrades came out and they notified me, came out upgraded, and no charge on last upgrade. Always fast on response, and looking to help keep me protected.