Here's some videos of my Summit with a MMM installed. I've done lots of experimentation and have made it a much better crawler, but I just can't get it where I want. That's why I'm thinking Tekin.
http://www.youtube.com/user/roof89
I talked to the president of Tekin today. I think I have a waterproofing solution and he agreed it should work. I'll work on that once I get a brushless system working. I may just end up going with a Kershaw dual 700 kit, so I'll worry about the waterproofing later.
Oh, and thanks for the welcome. Is it better to say I came here via the Traxxas forum or the Nambla forum? I'm not sure which is considered worse around here.