Every user of TT-01 knows that this parts are wearing off quicker than other parts. Especially with brushless sets, which devours all gears !! Of course it depends also from your driving style. If you are pushing flat out all the time even on stock motor you can destroy gears. Anyway, quality as other Tamiyas items on the highest possible level, withuot any objections. One remark, color of new G parts set is not white/ivory but BLACK !!