No first hand experience, I shopped for one a few years ago. I really liked the 968, always scared off by the 928. Check into the cam chain on the 968. I was looking for a dead reliable DD and while I forget some of the details I remember the chain and tensioner arrangement was a bit problematic and more $$ to fix than I wanted to spend. I dont think its a deal breaker, just be sure to read up and inspect if you go that route.
http://www.rennsportkc.com/968-cam-maintenance/