I like both motors fine. I think the MVVS is a little hotter than the OS. but can't really give hard core proof. Actually I have two Pats in the box[>:]. Kangke and the SA = no retracts. They aint worth the amount of surgury it would take. The SA is the DC lookalike. In the pics its the red one with a white stripe. I really liked that one too. The DC original will accept retracts. A clubmate has one that looks awsome. I should have bought the kit before he did. I think Juno RC has the same one available here in the USA now. I recomend getting one while he has them availble if you can.