I upgraded from an '02 525i, which I loved and was afraid to sell, to an '08 528i and the '08 is a totally different animal. It has been perfected inside and out. I love iDrive and I can't understand why every car on the road doesn't have an iDrive system. I love the iPod adapter they offer and it's simple to use. I encourage anyone in this luxury market to drive this car. I can't wait to drive it again.
IDrive, iPod adapter, sport package seats (amazing), appearance, bluetooth system, 4 years maintenance.
Nothing that I can think of, better mileage maybe, but new EPA standards make mileage look bad for all '08 cars. Otherwise, car has been perfected.