I must say the biggest complaint would be the look compared to an X3. The X3 never appealed to me or my wife. The X5 has a nice smooth distictive look(E53) and the new X5 looks like an extended X3. I'm going through the same dilema with my M3(2003). I like the new features but the new looks are not appealing. My personal experience when I drove the 4.8 was my own and I was just curious if other people felt the same way. I want to try it again with a 4.8(sport) and with navigation to get a direct comparison to my current 02 4.4. The other piece is the price...I just can't find enough improvements or features that makes it worth the sticker!! I'll give it another go...but I'm just undecided at this point.

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2011 X5D
2007 M5