mnathani: I use FreeNAS fairly extensively. At its core, it's no more than FreeBSD (and of course ZFS) with a pretty GUI and some other features.
Don't think I have any complaints... I keep using it, so that's something :p
Not to mention it passes the "if I get hit by a bus, can someone else pick up the docs and learn it" test
mnathani: so to answer your question, yes I use it for mine and my company's day to day storage needs.
m0unds: http://redd.it/2428s6