I have the 5902. I didn't buy the smart start add-on, but the option is there. It comes with a real nice color screen remote, Remote start, security, 1 mile line-of-sight range, car finder (which chirps the alarm, and flashes the lights a couple times), there is a feature that will remote start the car automatically if the temp gets too hot/cold, it has a timer for street meters so you know when your meter will expire, 4 aux switches for different stuff like trunk release/windows/hood etc., you can turn on your defroster...