I used to use PokerTracker a little and that HUD does bring in some information but do we really need a HUD?
In my view, if we use HUDs too much we will end up being bad players as all we do is make decissions based on some numbers of different hands we played with that guy in the past. If he is a good player he will probably vary his play a lot and we will not get much information out of that. For instance, let us think about Barry Greenstein. All people know that he always C-Bets but we never get to know when he is bluffing with that C-bet or does have the goods. The HUD will say that he often C-bets but what information does that actually give.
Isn't it much more important to simply look at the tables that we play in and see how the players play at that particular point in time? One day I might be highly aggressive and in another day super tight. My stats will show something else and the guy that trusts the HUD can get really destroyed.
What do you think about these HUDs? I believe that we should not use them. Tracking hands and analyzing them is something else.