It's a bit hazy now. I think I was unable to connect to the SFM share with some systems, while I had no trouble with netatalk. It worked OK with System 7.5.3 anyway as I used it when I was installing Copland (you can see the Shared Folder on the desktop).
I had it running on my XP bootcamp partition as my PC was running Windows 7. Moving to netatalk made more sense for me as I had more stuff on the PC that could be shared out.
