I may have a look again some day but I can't hardly remember its good points! It's been a long time since 2002. I think that it is used in CERN right now
I've been studiing open AFS during a period of time and at last I have left it due to the bad documentation. There are several errors in the documentation. Beside of this issue the documentation referrs to the CD-ROM, but most part of the people will download the RPMs from the web page. There is no support for these people. The RPMs do some of the work specified in the installation guide but you just have to guess what is already done.
The mailing list is also a bit caothic.