I think that the biggest thing about the Aircore is the different construction methods and the fact that it is a plastic fluted cardboard. Not too many hobby shops stock that. Yes, they are heavy, but they can take a lot of abuse. I've flown them and built them. Once they are trimmed out, they fly no different from anyhting else. The AirCore trainer needs a good .46 to fly well. I traded a Aircore Colt to a friend of mine, but he has not put it together yet. Maybe I'll get it back and get it flying.