I tried it back when obsd included a client, hooking into the public list was amazing, you could almost see an alternate web in there but based on the unix filesystem instead of http. unfortunately afs was dropped in 5.2

The big disappointment for me at the time was that obsd did not also include a server component so it was comparatively much more difficult to use afs in your own infrastructure. The lesson being always make the effort to include the server side if possible. Without that you feel like a second class citizen.