Rear tail lights are cool. I have an 08 and I don't really care. I put Blacklines on my SSII which I think gives the back end a different look that I like. Having the I-Drive user interface would be great but I hate the actual new I-Drive button interface. I like the simplicity of a single stainless steel wheel. Very class. Also notice that the CD prev and next buttons have been moved below the row of programmable buttons. I think the prev/next buttons look out of place. Almost like a last minute decision.
Overall, the 09 M3 is an improvement but in my opinion, pretty minor.
Of all improvements, I would say that the fully integrated iPhone is the best improvement
