[iggymcfly]

I don't know how you get "easy AA" from someone open-raising in the hijack. A lot of players would play 4567 or 4678 like this. And even if he does have AA, he could easily call down with A4. Even HU, you'd need a really specific read to make this profitable. Maybe if you'd played 5,000 hands with him and you were absolutely sure that he only raises high cards from that position, it might be worth it coming over the top. Usually this is a pretty big spew though.