Yesterday I saw somebody played a modified version of ESky FP004, with brushless motor and upgraded rudder motor. The performance is so good. One of them is using the King II main body and the main rotor part and tail are from FP004. What is amazing is that it fall from 20 fleet. The main blade obviously broke but after a short time it was repaired with minimum cost and time, and it can fly again. FP004 is cheaper and much more easiler to repair than King II. So I think it is very suitable for beginner. But certainly it need certain modifications.