CLS55 AMG, 560SEL, 800BHP Rothmans 911 / Range Rover
I don't know about remapping the 270 engine but I think they are quite sluggish in the ml, definitely worth doing I'd say. I recently remapped my 3.0 diesel (mercedes engine) in a 300c and it improved it massively. Although I won't lie my fuel is now worse and it was meant to be a middle map that gives me better mpg.
Interesting ! the company say they will give me 30 days to try the remap and if not happy they will return to normal they are looking £210:00 , it seams to be the going price here in North Ireland