Forgive me for I have strayed (I had an Audi S8 and no Merc for a while), but I have now returned:last week I bought a R171 350 and I am lookinhg for a facelift CLS 320/350. Can anyone help me with the following questions?: What car features should I make sure I get on the car I buy, and which are rarer than hens's teeth (eg sun roof). At what mileage does a CLS start to high mileage and to be worried about? Any other advice appreciated.