Good morning Barney, I dare not talk to in depth about the power of it as my PvP tamer friends would be most unhappy if I merited their pets and specs a nerf... lol.. but you will find that the old school pre pub 2 slot mares do very well, with a lot of builds right now.. they are about the only pets I would ever suggest using mage mastery on, and only for PvP reason... if you like message me and I will share a few PvP tamer builds and how they combo with their pets.. but as I said before I dare not openly post to much data about the better combos and builds for it .. ^_~