Have flown both the Mach I and the II, the II is a bit less trainer ish. Flew both with an evo 46 and 10x6 and 10x7 props. Decent little planes, great price though. Will move fast when level, and it will do rolls and loops. The mach II is still alive and flying in New Mexico now. And it survived the usually dents and dings, wing scrapes, etc.. I have since bought a Hanger 9 Twister 40, yet to be flown.