i had a turmoil rtr and now have the pro roller. I have raced this thing hard, the only trouble have had are ball ends popping off. you can add a washer between the ball and the cup to solve this problem. But most guys will agree if you can not drive good you will break something no matter what you own. I club race every week on pave ment and dirt, more dirt now, pave ment is hard on them. especailly with wooden ramps