I really like my Zenoah engines and have never had a minutes trouble. But the I have never been a real 23 fan. I guess maybe since I have never owned one. I have seen people use them on the Ultra Stick, Stingers and even a poor GP Pitts. Yes it may be great for scale aerobatics in this plane, but it does not fair well in the fun fly type planes. Also I wonder sometimes about H9's suggested equipment. They say you can fly their 1/3 Sukhoi with a G62. It does alright with the GT80 but I would not use anything less.