I'm mostly affliction specced at lvl 69. I have just enough points in demonology to give me the extra stamina and intellect, as well as imp VW to tank for me. then just enough in destruction to get shadowburn. the rest is in affliction and i love it for questing and raiding. most of the time i can DOT a mob up with curruption, soul syphon,and curse of agony, the imp life tap to get all my mana back then imp life drain to get all my health back, the whole time the improved VW is tanking. at the end of the fight i have all my health and mana, no need for taking time to sit down and drink or eat. every once in a while i have to heal my VW but rarely. it makes questing much faster and saves a little $$ on food and drink :)