After reading the review of others which said the suspension and ride of this model year was not up to BMW standards - I was suprised. The car is about as smooth as can be. It is a pleasure to drive. I see no flaws.
I purchased my X3 the first day I saw it on the lot. I have owned SUVs for eight year and love the elevated feeling they provide but I wanted a 'classy high quality' vehicle. I've found the X3 to be all I've asked of it. My only 'complaint' is the overly stiff ride. I know this is not uncommon with BMWs. Overall it's great and fun to drive.
The performance, when required is all I'd ever need.