I have an AP 1 car and an AP 2.5 car. It all depends on where you are driving. Controlled freeways with good GPS speed limit data, and AP 2 seems to be more stable. AP2 handles crappy freeway lane markings better than AP 1.
HOWEVER. AP1 can be used more fully on roads that are not designated as highways in the map database. It can read speed limit signs, and can do AP lane changes on those roads, where AP2 may be restricted.
If you are going to keep the car a long time, get AP2. It will eventually have more features than AP1. If you are just going to own a car for a few years, save the money and get AP1. Trade it in on an AP2 (or 3) car once the next generation AP is more stable.
HOWEVER. AP1 can be used more fully on roads that are not designated as highways in the map database. It can read speed limit signs, and can do AP lane changes on those roads, where AP2 may be restricted.
If you are going to keep the car a long time, get AP2. It will eventually have more features than AP1. If you are just going to own a car for a few years, save the money and get AP1. Trade it in on an AP2 (or 3) car once the next generation AP is more stable.