Crap- would rather have a proper panel with hardwired zones- CO and Fire detection and local monitoring.
I have cellular, IP and Telco reporting on one panel- also - you only have to sign a contract if you go with some crappy company like "Always Done Twice"
If you live in an apartment or dorm guess this is good- for a house- its crap.
(I can access my unit from my cell- control z-wave and x10 devices and even send sms commands.)
I you want a good alarm just dont use ADT- find someone local who does proper alarm work and wont do contract installs, and require that they have a local in state call center- not some baboons picking up phones three states away.