Mine was a Viper and it was excellent excepte for when it was left in gear.

Another thing to consider: If it is left in gear and it starts and hits a car your insurance will not cover it. If you hit a person.......lets say in a mall or store parking lot.........BIG problems. But if you are not at all concerned with that liability then do what you feel you need to do. If you want a Viper remote start only go with the DEI-562T. If you want alarm w/ remote start the Viper 850XV is great or go with the new Viper Responder 791XV.........its pretty badass.