Ive used hex alot in UK/Gundrak due to beeing undergeard, alot of boxers laughed of me when i hexxed but i did 4 heroics without beeing critt immune on my tank and the only item i ever bought for him was the epic tanking helm!

I dont see the point in trowing it into the rotation when you can just hex in the start and tank away, concentration doesnt break hex from what ive experienced!