In light of the ToW changes (not stacking), I could see the advantages even more than before of bringing a Space Owl to a 4 shaman group. Personally my Moonkin is waiting at 70 for my Shaman alts to reach 70 at which time she will be joining them.

I have done some Moonkin offtanking and it is fun. If you really want to do so be sure you avoid threat reduction talents....

Honestly Moonkins have good Synergy along with Shaman.