Here some report of my recent X5 experience.
After 7500km the clutch let me down. Not quite sure if it was my fault. Did go up a muddy slippery mountain road and had to play with a clutch a lot to prevent the rear tyre to slip. After that i noticed that i could only get power on the wheel when reving high. After stopping i could let the clutch go completely without getting any power. We called it a day and build up our tents. The next morning after a little fiddling around with the clutch cable the clutch was at least good enough to make it back to beijing, still suffering from a slipping clutch. I have now replaced the clutch plates and it is ok again. Besides that still happy with the bike.