I checked mine at the weekend and they were in a far worse state than the ones in your thread http://www.xt660.com/showthread.php?t=21930 My bikes only done 4800miles? I should have taken a photo, the raised circles on one side are completely worn away and I could twist the sprocket assembly a couple of mill taking up the slack. All my bearings and chain alignment were fine.

I've packed them out with an inner tube from my kids push chair after reading other posts.

Does anyone make a heavy duty version? A lot of my bikes have had cush drives and I've never known them wear this quick.