[Schwartzy61]

Well I think the biggest problem is people rely on big general stats that don't really get to the heart of what type of player you are against. So he plays 50% of his hands, if he folds on the flop 90% of the time he sees it his VP$IP isn't as important anymore.

This is one area where Advanced Export Notes is really well used. You can add a number of specific stats that can help you make a decision on every street. If you have enough hands on a player to make the stats reliable you can have his stats for Aggression broken down by street as oppposed to a general postflop number. Number of times he's checkraised, how often he folds to a river bet, how often he wins at showdown when he bets/raises. Even the hands he likes to raise with preflop if again the number of known hands is enough to make it reliable. All of these stats can help you make a decision much more often than VP$IP and PFR ever will. They aren't as reliable for players with few hands but if you are chasing the same fish around all the time, these stats will help you make much better decisions as much as "Being the Ball" will.