I have a Nexstar with the 46 LA, and its actually very good for training. You have to learn to fly the plane, not just the engine. The Nexstar is a floater anyway. Its not going to do any aerobatics as you advance with the LA. For power equivalent to the 46 AX, look for a Thunder Tiger Pro 46. Its got the AX performance for the LA price, and its every bit as reliable.

Brad