I've got an old 4 star 60 that I use to test stuff on, and buddy box people with, it generally flies with a Magnum 61 2c, and flies very well. It doesn't go vertical, but it has more than enough for anything that you'd do with a 4* 60. it'll do all the basica aerobatics, and has more than enough power to get you into and out of trouble. I flew it a few months ago witha Supertigre 90 that I wanted to test prior to putting it into something I care about, and it obviously had more power, but there wasn't much point to it, it was still a 4*. Meaning, it wasn't going to do 3d stuff, it just had more power to climb. Flying it took more throttle control, but end result was that instead of flying around at half throttle, I flew around at a little under half. Basically, with a 4*, put whatever you have on it, it'll fly fine.

On Supertigres, like some posts above have said, some hate them, some love them. I wouldn't say I love them, but I think they are great engines. I've had a bunch of them in from 40 size up to 90 size, and all ran very well, would idle forever, and didn't need to be messed around with constantly. The 90s have a more finicky idle needle that if not adjusted properly will make the midrange rich and effect transitions, but even with them set wrong, they still run great, and put out a lot of power. I've got one now on the front of an OMP Katana 70V2 profile, and it's a great engine. Hovers around half stick, and rockets out, transitions well, and I can count on it to stay running when it's pulled back to idle.