In part, I have SSH access to a few friends' media collections, mostly music. All accounted for, I've got direct and immediate access to nearly 10 TB of media, my own 2.5 included. I could, if I chose to, download their collections to my Hybrid, and in the case of videos, usually do. But, I use SSHFS nearly exclusively, for internal network sharing as well, and just want to stick with a stable, secure (encrypted) standard across the board.
In the case of a performance hit, I'm not sure I've got anything to worry about there, as all my hardware is well in excess of the recommended system spec... I've actually had to REMOVE RAM, due to the lack of amd64 support as yet, and spread the extra out among the MD's. Also, according to some (such as OP in this thread:
http://ubuntuforums.org/showthread.php?t=1090085), SSHFS performs much BETTER than NFS, in regards to the network...
Anyhow, it seems that I was incorrect in my assumption that I had set up the SSHFS / AutoFS correctly. I had access to all the media, until reboot, at which time the /etc/auto.master file was over-written for some unknown reason, and has been each reboot since.
edit: added reference...