the arf's are not the best (mainly due to covering). But I just love the ARC version. I put a .91 4-stroke, flying wire on the tail, and bolted the hinges in with 4-40 bolts, and it flys awsome. Because of its heavier weight you need to be a pretty good pilot to 3d with it. It has unbelivable vertical , it will go around 70mph horizontal and vertical!