Deke 
2006 BMW 5 Series Sedan 530xi 4dr Sedan AWD (3.0L 6cyl 6M)
530xi review
 This car is the best performing automobile that I've ever owned.  With that being said, it is the worst car ergonomically that I've ever seen.  The iDrive system is a total disaster.  Just trying to change the heat/AC is actually dangerous when driving because you must use the isDrive to do it!  Almost all setting on this car must be changed through the iDrive which is very finicky.