2007 BMW 3 Series 335i 4dr Sedan (3.0L 6cyl Turbo 6M)
Bought the car used, with a whopping 600 miles on it. Have had it for 3 months and added 7,000 incredibly fun miles. I have owned 2 jeeps (both soft top), 2 Volvos, 1 Lexus, 1 Benz, 1 Ford and 1 BMW years ago - this is by far the most fun to drive and the only one other than my first Jeep that has garnered great comments from other drivers. Took it in for regular maintenance service early at 7,600 miles as I don't want to wait til recommended 15,000 miles. I expected to pay for this one myself, but dealer took care of it anyway. Great car.
Acceleration, fun factor, looks and handling.
None, except minor issue with getting car into first gear occassionally (I got it with manual tranny)