Wow! $285 for an L can motor? You might as well get a Neu or LMT for that price (depending on where you are from)!
And from various reports, the Neus seem to work fine with the MM now that the new software is out, but like linc said, it depends on how crazy you get with the gearing...
That price is way out of line, hackermakes a nice motor, maybe 200 bucks for an xl, but almost 300 for a l can is crazy. I really need to buy a neu motor and try it out so that i can see the difference.