I have had nothing but problems with my X3. The software for the bluetooth phone and GPS had to be reloaded several times because it starts acting flaky and eventually just dies every 3-4 months. The GPS has the worst user interface I have ever seen. The bluetooth phonebook interface is horrible if you have a PDA. The iPod adapter is useless (does not display artist or title). The main issue, though, is the transmission. It's jerky, especially when going uphill or passing on a highway. Also, the gas mileage is way below what they advertise.
Nice leather interior. Love the heated steering wheel, heated seats, and interior bike rack.
Fix the transmission issues and the interface for the GPS, bluetooth phone, and iPod.