Price is a bit expensive compared to other quotes, esp. as the job was complete in just over an hour. However, the speed of the job was down to the skill, experience and specialist equipment of the technician. He seemed to know exactly what he was doing every step, no hesitation at any stage, which gave me the confidence my car was in safe hands for this complicated job. I was also satisfied the replacement part was genuine from Mercedes, unless they have gone to great lengths to fool me, which I doubt.
Overall, an expensive but thoroughly professional job. I just hope the part does not fail any time soon, although OSG give a 12month guarantee which does help.