I have owned Mercedes, Porsche and several BMW's. I traded a 2006 M5 for the 2009 M3. Porsche is a pure sports car but the sports suspension is rough for daily use. The M5 was a Porsche with a Tuxedo. Not much to complain about except the SMG is no match for the DCT in the M3. The M3 is a sports car that you can live with every day. You feel like you are part of the car - it is balanced, agile, and responsive. The DCT is fast and the downshift throttle blips are better matched than I could ever do with a traditional manual. This is my third car with idrive and the new idrive is great - intuitive and easy to use.
DCT transmission, M sport settings, Sport seats, Gunmetal 18 inch wheels, idrive