 I'd looked at the M5 in '90, but passed it up in favor of the V8 in the 90 Q45.  Well, 13 years later I snapped up the last of the E39 design.  It is, in a word, the ultimate 4 door sedan. Styling is georgeous, power is phenomenal, handling is crisp and reassuring.  I've still not explored the upper limits of handling, probably cannot really do it on an open road. Perhaps track time this spring? Interior comfort, fit and finish are outstanding- rich but sporty, not 'plush and tufted'.  Radio is fantastic- better reception than my two other japanese radios.  But who listens to radio?  Just installed Sirius Sat Radio with BMW oem components (displays on the nav screen).  Mine has the MAudio