How many FSs are there for MorphOS? And if this one is as good as it says, why not? A lot of people bought PFS and still swear by it. So long as I keep backups, I do not see file recovery being an issue if my exotic PPC MacMini takes a nose dive.
Granted, SFS spans OS3, OS4, and MorphOS. I assume they are compatible as well. But I find that I have been using smb-handler to keep the majority of stuff on a SMB share, anyway. Of course, I have not tried running YAM across the network, so there is some concern there -- but again, backups, right mate?