Performance, styling, sound, interior. Essentially, all of it.
Cons:
On the coupe, the seat belts have motorized arms that push the seatbelts toward the passengers, because they are mounted in position that would be difficult to reach otherwise. The system seems a little overly complex. Price can go up quickly when options are added.
Overall Review:
I love this car. It has amazing performance all the way around- handling, engine, and braking. The car has an 8300 r.p.m. redline and a sound that is very supercar-esque. This one has aluminum trim and extended leather in the interior, which looks and feels great. The electronics and navigation are first rate.
The engine and handling are top-notch. The fact that it is available with a manual transmission is also a plus it has over its competitors such as the C63 and IS-F.
Cons:
The interior isn't as nice as other makes (e.g., Mercedes-Benz, Audi). A mildly annoying creaking sound coming from the rear roof/glass has already emerged with less than 9,000 miles on the car.
Overall Review:
I use this car as a daily driver (except when it snows), and so far it's been very rewarding to drive. Gas mileage has been fairly decent, better than the EPA numbers indicate. Have not yet had the chance to track the car. Aside from the creaking sound, no issues have arisen with the car.