We currently have a 2009 Mercedes Wagon with 15k miles on it. Also for context we have a Toyota mini-van and a Prius.
This current wagon only seems special when you are on the highway. There it is in it's element. Extremely smooth, quiet yet with the classic German feel. Other than price it isn't much different from the Toyotas.
Overall build quality actually seems to be less than the Toyotas I am sad to say. We have had a number of minor problems with the electrical and mechanical systems. The CD player still doesn't work. The right windshield wiper stopped working etc.
In general it seems as the though the car is several years behind the competitors in features.
Third seat a plus for the kids. Auto tailgate, but warning it doesn't close auto except with button on the tailgate despite what the manual says.
HVAC is simple and easy to use.
Nav directions int the instrument panel are great. Rear fog light is appreciated
Exterior design is very attractive. Seats are good
Mileage is good for a large 4 wheel drive car around 20 MPG.
Headlight range is ok, not great.
Outside Visibility is weak not sure if the mirrors are too small or just
something about driver position
Still need to work on quality control of the little things.
Car has bottomed out several times in places other cars don't.
The radio is very difficult to set up and switch around from AM to FM etc. NAV is also mediocre compared to the Toyota.