I purchased a 2003 X5 3.0 Sport for my wife last March with 41,000 miles and all options except for cold weather pkg. In the 14000 miles since then we have received excellent service from the dealership and aside from replacing the OEM Michelin tires with Kuhmos and replacing the battery the vehicle has been flawless, safe, quiet, and rattle-free. Insist on service records and if you can buy the extended maintenence package (3 year 50k including all services, oil changes, and brakes) for $1000 like we did you should be in the clear.
Safety, ride comfort and handling that is heads above other premium SUV's in the marketplace.
This model is due to be replaced in the next calendar year and the interior is looking a bit dated.. but the design is 6 plus years old now so that is to be expected. I hope that for the sake of simplicity that they avoid saddling this model with I-Drive.