I've had this car for 2 and half years now. I bought it when it was 6 months old, so as good as new really. I've been really impressed with the car from day 1. It looks the part especially when you get the pillar-less windows down in the summer - almost feels like a convertible.
Since having our first child it has become a bit tireseome getting the baby seat in and out of the back seat, there is plenty of room once in their, it's just quite an effort climbing past the front seats.
The auto box is smooth and the car is quick off the mark, even for a diesel. It isn't the best with MPG, I'm lucky if I can get 30 MPG on a daily basis, I can get just short of 40 MPG on the motorway.
Insurance isn't cheap and it's £200+ to tax the car for 12 months, and don't even talk about replacing the low profile tyres! But it's a mercedes, who said it was going to be cheap?
Overall a great car and I've loved the 2.5 years of owning it.