I had a new 2006 black Accord Coupe V6 with factory front and rear bumpers with spoilers. Performance was great comparing to its competitive products. However, the gas was not efficient comparing to its performance.
Interior design is great IF you install NAVI (personally, aftermarket is better than OEM). I was very satisfied with exterior design, since I spent 2-3k on additional bumpers.
I drove 160k on my accord till I sold it. It had no problems with engine or main machanical stuff. It's durability is awesome. I could've drove another 100k more without any major problems.

Mercedes is Mercedes.

Excellent performance with max. comfort.
If you are into "classic", you will def. love dark brown wood trim with black leather stiches for interior.
Chrome trims on front body is excellent, with wide body.

Fuel wise, u know its V8 with tons of power. @$1.4/liter, full tank = $130+ (91, premium) it goes about 400-450km (highway & local). IF you are concern about gas, think about 350 instead of 550. IF you love power, but do NOT wanna spend $4000 breakpad, consider 550 instead of 63AMG. IF you are rich, just buy 63AMG.