Well, I've got good news. The X3 is more reliable than the X5. It doesn't have a trick rear suspension, useless dual-zone climate, or untested electronics. The software and electronics are based on the E46, so it's definitely fairly stable.

One word of warning: I advise against a 2007 or early 2008 X3 model with the automatic transmission. Those are prone to serious hesistation and shifting problems that successive software updates may or may not fix. No one knows whether this is a transmission or software problem, or both. If you want the N52 motor with 260bhp, then get a manual. The '04s-'06s have great transmissions either way.

If you're lucky enough to find a manual transmission, this is a great vehicle to have it. Otherwise, main problems include creaky door seals on the 04s-05s (dealer fix: teflon tape on window guides), a moonroof that may rattle (replace entire moonroof), and that's about it.

Note about suspension choices: the 2004s had a stiffer suspension setup across the board that may not appeal to some. The X3 base rides pretty firmly no matter what; sport suspension may or may not be to your liking depending on road conditions. However, the X3 handles extremely well, and is terrific for urban driving. It squeezes between cars, responds quickly, and you can park or make a U-turn anywhere. It also has more cargo capacity than the E53 X5.

There were 3 OEM tires. The Pirellis and Michelins are very good. The Bridgestone Turanzas suck, no questions asked.