Well I'm not convinced of the need for speed of these new filesystems, if it comes at the expense of stability. if you have a need for big drives I can understand, but 4 gig flash drives work plenty quick on FFS, especially with directory cache and addbuffers.
In my experience with SFS, I've had two massive crashes, one on an IDE-ATA INTERFACE the other cyber SCSI INTERFACE, to the point that I had to resort to an old P2 XPPro system to even recognise the drive afterwards (an athlon x2 MB systme with XP and Vista point blank would not even see the drive), after several attempts, initialise it, format it, put it back in the amiga and format it again. With FFS. Not sure what version of SFS it was, but SFS ain't going back on any drive I own! EVER.
I had a simila experience with PFS2, so I'm not in a hurry to install PFS3 tbh.