I have one with an OS .61 in it and I like the way it flies. I'm new to aerobatics and it's a little hot for me since I'm now flying it with a radio that does not have dual rates. I'm gonna set up my 9CAF for it later. I also love the way it looks. Don't even think about letting it set for any length of time on those sorry foam wheels. If you insist on keeping them, support the plane with the wheels off of the ground or they will flatten.