Well, we've had our ACE 570 for 3 weeks now, and my son has already put over 200 miles on his ride!! He seems to be really enjoying the ACE. There is only one problem--he's never off of it enough! I have barely been able to get any seat time on the machine. We've experienced zero problems with the machine. So far, we are really please with the performance of the machine. I know my son will get many years of use out of it, and hopefully, he'll let me get a little ride time in, too.