The one part that bothers me is the ability to quantify opponents calling ranges on the endgame? This range becomes very difficult to quantify by the time the blinds hit cazillion/megacazillion that placing people on calling ranges has such a huge variance I would have a difficult believing the output when you are only seeing minute +EV percentages. I realize that so many utilize it that it must have merit and I am giving it a shot, but is it the tool or the players using it have such a good understanding of the game already that tool is merely a placebo?