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2011 BMW X5 Discussion
The 2011 is quieter (less road/exhaust/engine noise), the suspension is slightly softer, and the throttle response seems to be better because there's less diesel/turbo pause or hesitation before power is built.
Those changes add up to a smoother, more refined, less truck-like driving experience. You might not notice or appreciate the difference unless you went directly from a 2009 diesel to a 2011 diesel, but the difference is significant.
I was 95% happy with the 2009 and I love the diesel concept. The only flaw was a little too much exhaust and road noise that was a little too intrusive into the cabin. With this added level of refinement, I'm now 110% completely happy with the vehicle.
And kudos to BMW for listening to owners (like me who posted all over the internet recommending noise reduction to make the vehicle more competitive.)