The weight of the convertible adds a full 1/2 second to the 0-60 time.
That price is not a 'good deal' (i.e. I'd sell my bling-free 1 year old '04 coupe with less miles and full warranty for that). Also, is the factory warranty still in effect? I'd hope so. While I love drving my M3, I have had several frustrating problems - relatively minor problems, but problems that leave you dead-in-the-water! The latest? I hadn't driven the car in about 5 weeks. Got in last week, fired it up, and the serpentine belt snaps!! So, no water pump, pwr steering, etc. Before that? A door actuator was faulty. It made the computer think that the driver's door was open. So all of the dome lights were on and it would throw the SMG gearbox into neutral after sitting still for several seconds. The window would also jerk up and down because it thought the door was being opened and closed. Before that? Power steering gradually went out intermittently and then totally failed. Weird problems. The overall build-quality is outstanding and the car is a rocket, but these oddball problems leave me second-guessing the future.