I'm sure I don't need 5s for racing. I just figured the higher voltage would be more efficient and run cooler. What's the word on the update for the MM 4 pole compatible? If they come out with it soon I would consider running 4S with it. MM is great let alone Castles customer service.
The only thing I've heard about the MM update is "soon". Then again, the MMM was supposed to be released "soon" as well, and we know how that's going...