I have one as I wanted to be different to the normal M5 crowd. They are a cabable car but rust really badly. Mine looked great when I got it and two years later its rusting on the arches etc. Also they are all auto which I found to be shite for my driving style when I took it round the ring. In hindsight I should have paid the premium and got the M5. If I had the extra bonce I would have an RS6 over the Merc anyday.

When looking at the Merc check the history and make sure its complete. Also try all the electrics as there are so many things to go wrong in there! The Cats have gone on mine and Mercedes wanted 4k just for a pair of cats!