I have owned the 2013 M3 Coupe with Competition Package and DCT for about 6 months now. The 2013 M3 Coupe is a fantastic machine. The fit and finish is fantastic and the power delivery is excellent. Keep in mind that the M3 does not have a lot of low end torque (compared to other cars) and the power is delivered around 8000 RPM. I love that you can program custom settings to the M button. You can drive the car in "normal" mode and be very comfortable and easy going and at the touch of a button you have a race car. It is instantaneous and you feel like you are suddenly driving a race car. I added laser shifters and a built in GPS enabled radar system as you can be doing 110 in no time flat.
M button programming, handling, exhaust sound, performance, comfortable seats, carbon fiber roof, fit and finish. 0 - 60 in about 4 seconds with the DCT (dual clutch transmission). Stops on a dime. Chick magnet.
Some of the dash board controls under the navigation looks outdated and you cannot see them with polarized sunglasses. The extending arms that bring up the seat belts from the back are flimsy and will eventually stop working (happened in every BMW coupe I have ever owned). Gas mileage is pretty horrible although you do not buy this car for good gas mileage.