If you're referring to their 2015 kits, I have the 500W belt-driven kit. I like the wider belt, but they really messed up the crankset. The bearing in the freewheel isn't secured with a snap ring. It's just pressed in, so when you try to use it, it moves, and when it moves, apparently the insides (pawls) of the freewheel are destroyed. Mine died after about 3 days of very light use.