I've driven a 5.0 too and outside the sound and raw power of the engine... there was nothing going for the car, I mean absolutely nothing. Extreme body roll, unsupportive seats, interior uglier than some of Ikea's designs, same Ford cheapness all around, heavy weight, poor visibility and extreme large body.
A Z06 on the other hand, still feels like it's about to fall apart but is a much better overall car.
2009 135i 6AT
E40 PTF Protune, AR Dp's, 5" ETS FMIC, BMS DCI