I have the GT-80 on my sukhoi, and I am pretty happy with it. Compared to one of my buddies with a BME 102, Iam disgusted with mine. Mine vibrates alot more and doesnt have near the power. Im saving my money to get a DA-100, and after that Ill be lookin at the new Hangar 9 EDGE that will be coming out later this year. Anyways, i drilled the mufflers out on mine and I couldnt believe the difference it made. About 600 RPM on a pro zinger 24x10. I cant get mine into a good flatspin either. I think JohnVH has the best sukhoi anywhere. His will harrier with the best of them and I cant get a harrier out of mine if I wanted to. I have my CG about 2" back from the wing tube. If you are reading this JohnVH, help us both