I would venture to say that Tom Dwan has reasonable understanding of HU (yes in a cash game setting) or he wouldnt lay 3:1 on 1.5m to any player in the world except Phil Galfond. As of just recent, he has nearly pulled out of 500K deficit he was stuck with PA in a session no more than 3hrs in duration. They are playing pot limit, so the swings are inevitable, I'm just excited that after 16K hands dealt, its still dice :P