I love this car, though I admit it may not be for everyone. Its fast, beautiful, reliable and gets great gas mileage. Some german quirks, but I've found that quirks were implement to improve reliability, so maybe cut the engineers a bit of slack there.
Smooth and quiet when driving slowly, and a beast when you stomp on the gas. This car has been ultra reliable with awesome highway mileage.
Black leather interior is tough and stays clean, stitched dashboard and LCD panels are big, bright and easy to read. COMAND console minimizes the number of buttons on the dash, keeping it clean and attractive, yet functional.
Since my driving is about 50-50 city and highway, I average about 20-21 mpg, using premium fuel. All highway is 29-30mpg and all city is 14-15mpg.
Rear seat room & comfort
My wife refers to it as a sofa on wheels, my daughter sprawls out in the cavernous back seat. I just love the way it drives.
Audio & nav systems
The Audio and Nav are all acceessible from the COMAND stick, in the center of the armrest. Its generally easy to use once you get use to it, but sometimes I find mistakes take a long time to correct. While you may back out to fix your mistake, it does not remember anything, so you have to start over. However, the Nav and audio are rock solid reliable, and work extremely well.
Nav Traffic updates seem to work intermittently, though that may be due to the coverage in my area.
Controls and instruments
No rear backup camera (just proximity sensors), Navigation traffic works intermittently.
Dealer repair can be very costly. I use independent MB specialist, and they do everything for me for about 40% less than dealers.
Best dealer value is $100 Synthetic oil change with inspection, which I recommend well before the recommended 13000 interval, just for the inspection, especially after 60000 miles. The engine bay is covered and you will not see anything leaking, or dripping unless you get in there regularly.
So make an appointment on your way to work, drop it off and wait, have some bagels and coffee and wifi and get the full report.
If its not critical, wait and get it repaired elsewhere, unless your dealer is willing to negotiate a discount on the repair (which some dealers do).
Continental OEM are great, replacements are not. Stick with Michelins if you can afford them, as they are worth every penny.