I have been installing AccuAir kits since they started. They have came along way. There system has always been based on suspension height and not on air pressure. Air Pressure based systems are not accurate. I have replaced at least 5 Ridetech systems with the AccuAir systems and all those customers were ready to get rid of there bags until they used the Accu Air Systems.
I will only install Accu Air on my cars and my customers cars.
Check out the Accu Air System @ Sema....
http://video.streetlegaltv.com/video/11124