I have the top cap with a os 50sx .I love flying the one. It'll do every thing you want . waterfalls,blender.harrier(tip stalls) but I cant get it to climb on the inverted flat spin. It might need more tail weight.It will hover but the longest I can keep it there is about 15 seconds. I also have the aeroworks profile extra with a 160fx. I realy like this plane . Its helped alot for hovering.I think this one is the way to go to learn 3d. Ialso have the doghouse with a 91fx. I only flew this one once becouse the weather turned to crap. with the 91fx on it . it is a rocket.at 6lbs even