I learned to fly with the superstar ep. I dont beleive it is underpowered becasue I flew mine quite well with its power supply and I went very high in the air about 400ft! And this was all stock with the Nicd pack. However I have gone to Nimh 7 cell 2000mah cells from great planes and all I did was replace the stock engine with another stock one becasue I bent the shaft in a crash. Besides that the plane flies well and lands nice too.
Sam