Bought this X5 4.4 used, with 28K mi. and the Dinan package (throttle body, exhaust, 19" rims, etc) from an AZ reseller. Whoever traded this truck in was nuts! This one's for keeps. Performance is BMW-esque, suspension firm, but not harsh, and handling outshines most sports cars. And the Dinan package puts it in a league of its own. A note of caution: max out on an extended warranty. It will pay for itself. They just don't make 'em like they used to. Speaker grilles fall off, cup holders fail to close, electronic gremlins that you just learn to live with. If you live in good terrain where the roads are long, you'll love it for all the right reasons.
Get that non-ergonomic (but great sounding) radio and other electronics (like PDC) to be more reliable. I get frustrated in having to bring the vehicle in for such minor repairs. And why does every part have to be dealer- bought? My wipers don't perform right unless I purchase BMW blades!