Check the alloys. They are prone to cracking and the run flats make it worse.
If you can find one with the DCT gearbox it is well worth having, it's as good as the PDK. They are rare as the DCT was a expensive option and a basic auto was also available.
They feel quicker than m3's to most people on the road, due to the torque and the fact that the m3 v8 needs to be driven hard, due to its lack of torque.
It's also worth getting the OBD port moved or secured as they are really easy to steal. Tends to be M3's that the scum bags target though.
Overall great cars.