I dig the stems, but the bowls' finish just isn't my thing. When it comes to cobs, I prefer the natural 'finish'. I hear they smoke a wee bit cooler too (although the difference might be negligible).
Amisk, there's also Old Dominion. MM and OD are the only cob manufacturers I'd buy from. I've one MM cob, and 5 more pipes from MM are en route (three cobs and two of their Ozark hardwood pipes—which I've heard good things from them and can't wait to try).