I recommend it as I love it myself. It has better mpg and better throttle responce. But it need to be done right and with brain - not just for power...
There are so many turbo diesel ecu mapping service or piggy back ecu chip available in the market.
Too many to choose from but make sure this will not invalidate any warranty your car my currently have.
I like the idea of this remapping - better mpg, better bhp, better torque and doesn't invalidate your warranty or insurance! How much do you reckon this is likely to cost on a C-Class (just wondering whether it's worth thinking about over the long term) and is there an abundance of stuff more likely to go wrong after it's done than if all was left well alone?