Heroics no.

Normal leveling - as long as you have SOME kind of AoE heal (as in a priest) then it is viable. 4 Mages + 1 Priest is solid although if the priest dies, you walk back.

Hellfire + PoH = WIN. 8 minute soulstones. Just have to be careful to not kill yourself and to setup the macro to not cast when channeling so you don't waste mana.

See: http://video.google.com/videoplay?do...77047813191722