I've been a customer of Counterforce for several years now, and have never had any problems or complaints. I deal with their dealer, Guardian Security, and I'm so happy with the service they provide.
I recently cancelled my home phone line and when I did, my alarm stopped working. I called Counterforce, and within hours, Guardian Security showed up and upgraded my system to run through my internet.
As I read the other reviews, I was surprised by the negative comments, but I think that may have to do with with each dealer people deal with. Personally, I've dealt with several different alarm companies over the years, and none have come close to the service and value that I've gotten with Counterforce.