I am not that fond of them, especially heads up. I'd rather play them with 4 or 5 others in the pot. Heads up, they stink because if the other player has anything, he is going to raise you. Normally if you get a good flop, you are still drawing to the turn and river. You, in essence, become a chaser. These hands are also dangerous because, even if you hit your flush, there is a good chance its not the best flush. If a 3 flush is on the board and you bet with strength and get called, now what? You are vulnerable and can even get blffed out of the bot by a better player.