I'm in the same boat and thinking about the hangar 9 twist and a 55AX two stroke or a pulse 40. I have a tuncano 40 (scale WB Brazilian AF trainer). The Tucano is way to hot for me at the moment. Or at least I think so. you have to land it hot and for some reason that really scres me, at least until I get more flight hours under my belt. I have also been flying the park zone typhoon2 3D. It's low wing and great to learn aerobatics on veery tough and easy to repair. All the guys at the field tell me that if i can fly the Typhoon then I can handle just about anything, actually am to where I can Knife edge, fly inverted and hold a hover for a half second, but in my mind I'm not ready. From the reviews I've read about the twist and the pulse, it's a toss up. the twist is easy to handle and can land slowly on a dime, but will bite you if not careful. The pulse handles just as well but not as 3d capable as the twist. So, I'm undecided at the moment. Will most likely go with the twist. It is cheaper. Although if I bought the pulse, I could keep the tuncano (up for sale at the moment) and use the fox 45BB engine from it to power the Pulse.