My 2009 E320 BlueTec is a superb automobile. Subtle yet classy styling (black exterior/interior/wood trimmed steering wheel) that always draws compliments. Extraordinary performance (400 ft-lbs of torque mean effortless acceleration - the power surge is like a locomotive). Unbelievable economy (I'm averaging 33 mpg over 25,000 miles of mixed city/highway driving in the Washington DC area). Comfortably seats four adults - meaning large adults! - and can accommodate five. Huge trunk. Smooth, quick, confidence- inspiring, so solid it literally feels like a single piece of steel. This car is an absolute bargain and I never thought I'd say that about a $50K purchase.
Performance, styling (people literally scramble to get out of the way even in DC), solid feel, economy, sound system quality, build quality (not a single flaw in 25K miles), value for money. Speaking of value - get the MBTex (Mercedes vinyl) vice the leather and pocket the savings. Outstanding!
The navigation system interfaces are not intuitive, but it is functional once you take the time to figure it out. The cruise control stalk is placed a little too low and the turn signal far too low, which takes some getting used to.