I've used PFS back from days it was still a hobby project called PFS. It later changed into AFS, then back to PFS2 and finally PFS3.
I turned to AFS only when the ffs2afs tool was made available, and I could convert all remaining ffs filesystems to AFS.
I now use PFS3 on my Pegasos.
PFS/AFS/PFS2/PFS3 has never caused any problems or data loss.