That's a fine looking NAS/appliance box. Let us know how it goes, because I may pick up a few them myself, just for RAID file sharing and backups in the office.
I haven't looked at FreeNAS for a year or so, but from what I remember, it was no good in multi-user environments, which is essential in many of the ways I tend to use network storage. If it supports multiple users, with different privileges on shares, then it may be time for another look (so I can use some *really* old PCs gathering dust).
-- JJ