Foody ... I bought a few and used one and it was not a good experience. Firstly, the prop adapter was not drilled deep enough, so the bolts will not sit flush, your prop will not be level. I had that on 2 motors. One of the motors had its magnet detached when I powered her up. Many complained about such problems when the motor is pushed hard but of late some feedback is that the motor is muach better. I have read reports that some users drip CA onto the sides of the magnets to keep it in place. If you will be pushing the motor hard then get a branded on like Hyperion or AXI etc. DualSky motors in the 42XX range or below are pretty good, I used quite a few.