The quality is poor. A screw on the weights loosens easily and the entire weight came apart mid-workout, fortunately I was able to assemble it back together. It also does not transition well adding and subtracting weight. It's time-consuming to use these as everything has to be positioned perfectly (and you have to continue playing with it to get it positioned perfectly) so that you can adjust the weights. If you only use one weight size per work out then it might work fine but if you're following a workout video and need to change between various weight sizes, it does not work well at all.