Although I've only had my 650i for a week or so, I am already impressed with the quality and feel of such a high performance, luxury coupe. It has plenty of power and very stable handling. My last car was an '05 Porsche Carrera. This BMW is much more luxurous and as much fun to drive without all of the bumps of a much stiffer suspension. Beautiful lines, classy interior, and the iDrive isn't at all that hard to use once I spent some time with it. I'm very pleased with my choice.
Styling and looks, very classy car, inside and out.
Cup holder was an afterthought. Sliding roof would be great.