Nate,
Here is a link to the research done by the mbcoupes forum. The overall impression is that it is a good product, but not much bang for the buck, considering that the bottom-ends of MB engines last so long already. I would likely install this product on a newly rebuilt engine, though.
http://db.mercedes.cx/sec/200204/03/0009.html
Cheers, Andrew Seidel.