Quality of Yokomo is nice imo. I've driven X-Factory (and thus Associated) before and i find that Yokomo is a bit better. Especially with the arms, they are soooo sloppy on the Asso.
Gears are the only downside on the B-Max2 imo, but they are replaced (as an option though) with Alu versions - even though I still drive the standard ones -
