The Psychology of Poker, as the name suggests, concentrates on the psychology of poker players--mainly the 4 basic styles. The book tries to give an insight to the desires and fears that drive a player to play the way he does. It also tries; of course, to help you understand yourself and give specific advice about how you can change the way you play and be more tight aggressive.

Mr. Schoonmaker emphasizes the point, way to much in my opinion, that only tight aggressive play is a winning strategy. While in my experience it is the easiest to learn to win with, I question that it's the best style for NL/PL holdem. I also don't think that it's the only way to win in PL omaha, PL omaha hi/lo and fixed holdem. I'm sure that in most Pot-Limit and No-Limit games a loose-(or at least semi-loose)aggressive style can win more money than a tight-aggressive one. However, it is much harder to learn, especially the hand reading, and as such only recommended for good players.

The specific advice for the different types of players also only covers fixed holdem and stud, and whenever he goes into game selection he refers to fixed holdem only.

I think a point can be made that loose-aggressive players, and even tight-passive players are probably better suited for No-Limit holdem than fixed limit, because the former has to work less on his preflop hand selection and even his postflop play and the latter can probably make a lot more money simply trapping people when they try, as they probably will often, to bluff him out of pots when he actually has a hand.

Overall, I think that it's a good book if you're trying to understand why you play the way you do. and i think it's a great help if you mostly play fixed holdem or stud. however, i don't think it will help you improve your game if you mainly play No-Limit holdem, or even NLHE tournaments, given that you're already reasonably tight (or don't want to get more selective) preflop.

I do think, though, that it will help you quickly classify your opponents and give you a few strategic guidelines to apply before you have a better read on a specific opponent.