An alarmingly fast, stable, barn burner with more panache than I'll ever have. After owning three 5 series I couldn't bring myself to "love" the styling of the new 545. The 645 exceeds my expectations for speed, comfort, quickness, looks, control and, did I say speed?
The 6-speed is a quick shifter which is great for this "purist". The performance button gives trememdous response between your foot and the power of 8 cylinder acceleration. The sound system just adds to the experience.
The I-Drive, well, ok, I could do without it. It would also be nice to have a real sun rooof.