Changed mine at 90K, though it wasn't slipping in the least. Did so because, (1) I wanted to do the IMS bearing, and (2) Jake Raby has been advocating that you don't want to wait too long or the rivets will be chewing into your flywheel, necessitating that it be replaced as well. I got it about right...mine was worn to the point where that was about to start happening. I think I'm not too hard on a clutch, but someone else owned the car for the first 20K miles---I have NO idea how he drove.
The IMSB? Looked/felt perfect. It's a peace of mind thing I guess
