If you've to ask for opinions before buying a Mercedes, then you probably shouldn't buy a Mercedes.
There's a good reason behind why 10 year old Mercedes cost as much as a 10 year old Civic (If not less) in U.S:
Both cars have same model year, same condition, relatively similar mileage and despite Mercedes having a larger 3,000cc 6-Cylinder engine and WAY more accessories than The Civic; it somehow costs LESS!
That Mercedes' MSRP was over $40,000 back in 2008 whereas The Civic cost under $25,000.
But despite that; Mercedes cost less than a Civic after 10 years!
Go figure.