Sure, it looks a bit ugly, but I bet the driving experience is as visceral as one will get in the full-dress luxury sedan category. Well, who knows how the S55 AMG does, it's probably pretty competent, but it does cost a good deal more than the 745i.
I'd really want one if it followed more in the mold of previous 7-series, with a more BMW-ish interior, with a shifter on the console, not on the steering column like a Ford Crown Victoria.
-Sam