You should probably wait until the mage update before really trying it, as the item will get adjusted. Though as a prediction, The new RoA looks as if it will have a reduced base stats, but at a reduced cost, so it may be good if you are able to rush it quickly.
They main question with RoA even now is, is it better to build an AP Bruiser, or a hyper tank. And the Bruiser build is probably a little better at the moment, given that the really strong tank items arn't good right now, yet Bruiser items like IBC are pretty ridiculous. Also, I've seen RoA on Maokai in the LCS recently, so there is probably some merit to it.