Breaks easiest - so order many spares. Fit screws little too firm, and the weak, poor quality plastic will break :-( Mainly a problem of the very poor, very small (much too small for the SP 180 in my eyes) screws. Nine Eagles uses the same tiny screws as used in the SP FP (27 g) heli for the much, much larger SP 180 and also for the SP 100 3D, crazy.