I have had this x3 for 4 months and MAN, it's great. We own a 2003 325Cic, and the x3 handles and moves better. Stability and handling are just amazing, let alone the braking capabilities. The 5-speed auto tranny is just right and shifts smoothly, the sport program feels eager to go, downshifting and holding gears in the right moments and situations. The tiptronic manual program is great when you want to really drive. I would rather have a 6 speed manual, you lose invaluable torque with the automatic, but not a big deal. Cornering is just like a 3-series. The aggressive look is perfect, it tells BMW all around, love the style.
xDrive, 50-50 weight distribution, dynamic brakes and stability control, inline-6 smoothness, nice engine sound, sporty transmission, superb handling, panoramic sunroof with electric shade, bluetooth, mp3 playing, auxiliary input, 4-year warranty AND maintenance!
More power/torque (but this was addressed on 2007 and up models)