I am flying the ARF version of the TopCap. Using the Webra 50 w/ 12x4 apc gives totally unlimited vertical with instant response to the throttle. The cover job is very sweet looking and has good contrast in the air. My plane flies very light on the sticks with the CG at 5". The rolls are axial and no pull when flying inverted either. It performs all the 3D manuevers with ease. Very stable harriers and elevators using spoileron mix. Waterfalls stay tight without falling out into a knifeedge spin.