Since i switched to the MM from a Losi 22 my results improved. I have now moved onto the Ezrun 5.5t combo which has knocked around another second off my average lap at my local track. I've had no problems with cogging on a 23 pinion and its as fast as my friends LRP ssx / 6.5t motor in the same car and i was able to put it in the D at the EOS finals this year
I got mine from here for a resonable price -
http://www.giantcod.co.uk/ezrun-brus...-p-406413.html
If your after a system for just fun then i think its good value
Just my 0.2p