This looks to be a similar-but-updated board (newer Atom, newer glue chip, same NICs) of the X7SPE-HF-D525, which I've used very successfully. Mine is packaged as a 5015A-EHF-D525 server.
Your board is lacking IPMI, which something I've found very useful.
Atoms are limited, see this post:
http://forum.pfsense.org/index.php/topic,60783.msg328911.html#msg328911