any model/year to watch out for???

[Fraser]

Originally Posted by Clockwork

I'm currently reading reviews on the xDrive system and trying to find if anyone finds it a night and day difference over the awd system on the pre-2004 models...

I've driven xDrive and non-xDrive E53s back to back in a variety of off-road situations and xDrive makes a big difference in low-traction environments. If, however, you don't intent taking your X off-road then there's not much between the two. And, xDrive, or not, the E53 isn't really a proper off-roader due to its lack of wheel travel and lowish ride height. No dual range gearing doesn't help either. Off-roading an E53 also brings in the question of suspension (Sport isn't as good as standard suspension) and the wheel and tyre package (17s are better than 18s which are better than 19s etc).