The advantage to an astrostart model is that one can get a 2 way feedback system so it tells you that it is running, unlocked etc. The key fob has the option to run multiple cars also if you have both the keys on the ring. The astrostart model works verry well as far as not having bugs with the system. I had the dealer install an automate on the wifes malibu years ago and I was in the shop with it at least once every 3 months. Ended up removing it and getting an astrostart in that before I sold it. I have an older astrostart in my pickup now but am waiting to replace it with a newer 2 way system from Maxpower.