I owned a 2003 540 with the M-Sport pkg. I thought it was tops in all categories. This one is even better in all aspects. Handles on rails, 0-60 in about 5.7. I love the styling, and yes even the I-knob. It took little time to learn, and after you make your settings, you rarely use it again.
Styling, handling, power, wheel design.
Not many, it would just be picky. The inside door handles should be metal and not the fake metal plastic. In a car over 62k, that just ain't right.