The first engine I owned was a Thunder Tiger GP 25. I taught myself to fly when the field was not so busy in 1997. When it was time to stop flying (can't call it landing) the plane would just come in and cart wheel. That little engine went through it, same as the plane
I sold the combination not too long ago (2000) and it has been performing flawlessly for the new owner as well. I would not hesitate to buy a GP 25 again myself.