Having just acquired a Mercedes S class I was disappointed with the quality of the standard Mercedes sound system. I therefore decided to upgrade it to a Burmester system. It is expensive but considerably less so than Mercedes by using Braybrooks and the quality of the workmanship is second to none. Perfectly fitted; no squeaks or rattles and an exceptional top of the range sound.
It was well worth the cost and the 720 miles round trips
(half of which were in the courtesy car supplied by Braybrooks).
If you need a Mercedes retrofit or upgrade I would have no hesitation in recommending Neil and his company.