What I like about UnRaid over freenas, is Unraids spread of whole files over the drives (not striped). Formatting is the same as FreeNAS I believe with Reiserfs, meaning that if a drive falls off from unraid, chances are you can boot it up as a slave to any Linux OS and copy your whole files off. Not sure ZFS (FreeNAS) can do that. Anyways, nice little clean build. Looks great Have fun with it!