I had one with a TT36 Pro, 11x4 Zinger prop (for light weight), PSP muffler, flew hot, built it pretty much to plan. Spins real fast, good vertical with the .36, flies like a puddytat if you knock the throttle back a few notches, lands easy. I would call it a great third plane, although if you keep the speed down you could use it as a second plane with a little guidance from an instructor. This is a classic fun-fly, very nimble, scores lots of points if you're good on the sticks. I've seen power maniacs put a 46 on it, but it's plenty snappy with a good .36. I will build it again after I catch up on a few other projects.