I have owned three Somethin' Extras. One with an OS-70, one with OS-.46FX, and the last with an OS-50SX. I currently fly a kit built one with the OS-.46FX with an added Tower Muffler. I swing one of the new 14x4 wide APC's and I added TNT landing gear for the prop clearence. The plane is a hover queen at 1/3 throttle and the low and slow performance is so much fun that I dead stick land often from an empty fuel tank. One draw back to the TNT gear is that they are rigid and they will fatigue the bottom of the plane, even if you are greasing in your landings. I hope this helps!