I've never heard of anyone legit (plenty of fake/shill posters claiming satisfaction, but was easy to tell that was BS) being satisfied with their MM experience.
They stayed in business because they preyed on two types of people - those that didn't know any better (not familiar with the real cost of a Porsche 911 engine rebuild versus an American V8) and those who think that they can actually get something for nothing.
This thread is a good read if you're not already familiar with it --->
http://forums.pelicanparts.com/porsche-911-technical-forum/254145-att-all-people-hurt-motormeister.html