If I remember correctly, there were several reasons I ended up ordering from MM. I think one was that I really wanted the stainless tower and the prices weren't all that different with that option. Another was it was much clearer on the MM site which parts came included with the unit. Yet another was the impression I would be able to get the unit quicker from MM, which was somewhat important to me because I was trying to have it set up before my birthday. I have a vague recollection, too, of trying to call the other place on the phone and not being able to get through to someone. I don't remember if no one ever answered, it was always busy, or no one ever responded to my voice mail, but I figured that was a bad sign when buying a $700+ piece of equipment that had to be shipped by freight.
My initial experience with MM wasn't all rainbows and unicorns, but when I discovered one of my faucets wouldn't stop dripping, I called them and the guy I spoke to cross-shipped another one without me asking. Also, this forum has been absolutely invaluable and now I really don't mind that I maybe spent a little more with them.
One of the threads here contains quite a bit of discussion about modifications for this model, with many of the posts from me. It also describes the mix-up I experienced with MM and the shipping of my unit. You can read all of that here:
Sanyo BC-1206S-2 Dual Tap