Just took this guy down on BB tonight very tough and long fight did it with 85pally, 85cleric and 85shamman. I will give you one very important bit of advice he does debuff you down to nothing and don't bother to rebuff because he will keep stripping them also have your healer stand behind one of the pillars because this will negate the debuffing and also the mana drain that he has.
All in all it was a great fight, long but really fun. Took a few runs to figure out the right way to attack him but once thats learned its not too bad.