We deployed this last month, taking part in the early access program. On the whole it's been of net cultural benefit for our non-profit. Our staff seem more engaged with the overall mission, better informed about what's going on and more likely to share information that they might have been reticent to share over email.

I really like that it's completely separate from my 'personal' Facebook, and it seems with the rebranding from "Facebook at Work" they're trying to emphasize that separation even more.