I have had my compustar for over a year now. It is the 2WSSAS, and it is a wonderful alarm. The only problems I have had is the "knock to call owner" sensor likes to go off on its own. I dont know if it is because of the cold up here, or if it is a problem with the system. I did install in myself, and it was a bitch. It wasn't my first system installing, I have installed several others before, but I do vow that it is one of the most difficult systems to do. Im not some DIYer person, I am a certified Automotive Tech who specializes in electrical. The problem is the system is designed to be installed by Firstech trained professionals, not the average DIYer who is doing it for their first time. So overall, have in installed professionally, otherwise you'll regret the troubles. BTW, I really didn't want to pay $700 to have it installed prof, thats why I did it myself. Bought it on ebay for $290. I'm not trying to promote someone to buy it on there, just explaining the reason why I did it myself.