I must say that I have read so many negative reviews on here that I must report my experience with SS. I have been a customer for 2 years now and my system has worked flawlessly! My system consists of the new version SS3 - 14 entry sensors, 6 motion sensors, 4 glass break sensors, 2 keypads, 2 outdoor sirens, 3 camera's, 1 doorbell camera, 1 door lock. Some of these I have added along the way. Anytime I have ordered extra sensors, they have been promptly shipped and I have had zero issues with integrating them into the system. Communication from SS has never been an issue. Connection between the base and sensors and Wifi are never lost in my 2600 sq/ft home. I have only replaced 2 motion sensor batteries and 1 outdoor siren batteries in the 2 years we have owned the system. So there you have it, I really like my SS alarm system but I'm only speaking on my system and experience with SS.