Check out their testimonials page. 90% of the poor saps that have these systems installed look like young hipsters who will have no idea why their Benz has suddenly quit running. I made the mistake of letting a friend buy a 75 300D, because he thought mine was cool, and I spent countless hours coming to his aid when he couldn't figure out what was "wrong" with his car. I once drove over an hour to help him start his car only to find he'd left the automatic transmission selector in "D." Some folks have no business owning these cars. Oh well. I suppose I shouldn't stereotype; maybe these hipsters all secretly own MB valve adjustment wrenches and are down with the BB in the EGR line trick.

__________________
1992 300D 2.5T
1980 Euro 300D (sadly, sold)
1998 Jetta TDI, 132K "Rudy"
1974 Triumph TR6
1999 Saab 9-5 wagon (wife's)