I've been in this hobby going on 13 years, flown all sorts of airplanes, and used every combination of spinners/nuts to hold the prop on. I have never had a single problem with any of them (uh oh, guess I just jinxed myself ) I perfer aluminium spinners but will use what ever looks best/scale. As for plastic spinners coming apart, like anything in this hobby (or sport if you perfer), if you don't install them right, they will fail. Make sure there is adequate space between the prop and the spinner, ALL tab/notches line up correctly, and that the spinner cone is attached to the backplate snug (watch to not strip out the back plate on the types using just machine screws).