The fuel-level indicator stopped working at 250 miles, requiring an "all-day" service visit to repair.
The "premium" sound system is actually quite mediocre.
The glove-box lid fits poorly.
The front driver's side wheel-well is a bit small for a big guy.
This car has snob-appeal! I get envious looks while driving this car (even though it is only an entry-level Mercedes).
Overall, I have been very pleased with the car and the dealership's service.
While the C240 is a satisfying car, I do not feel the newer Mercedes-Benz cars possess the same level of engineering and quality as they did years back. As to fit and finish, my old Toyota appeared more carefully built (though Mercedes materials are of much higher grade).
I test drove the C240 and wasn't turned on with its performance. I settled on the BMW 325i. Great car and fun to drive. owners get more for the money and heads still turn when I drive it around.