I agree with all the other reviewers: this book is Dan Harrington like you've never seen him before, kicking butt and taking names. Finally we get an entire book devoted to analyzing pre-flop and post-flop action across every decision point of the hand. Even better, Harrington has shed the pure conservatism of the first two volumes. In this book, he advocates a variable style of play that includes loosening up against more aggressive opponents looking to push you off the table. The first two volumes will give you fundamental, mathematically-sound conservative play. This volume includes a great deal of more aggressive, "playing your opponent" kinds of moves. This is brilliant analysis.
I absolutely cannot rave enough about this book. Harrington takes your hand and walks you step by step through the decision-making process in dozens of hands. Along the way, he scores the quality of your decisions. Although he remains conservative and likes to play a hand substantially according to its potential, he respects more aggressive plays. He discusses the merits and drawbacks to other types of plays throughout, and tells you what he would do and why. An awesome display of poker analysis.
Some books are so good that they define their field. Every book that comes after may agree, disagree, or clarify what a definitive book has to say on its subject, but there is one thing subsequent books can't do: they can't ignore it. If you're a serious tournament poker player, you can't ignore the Harrington series. This is THE classic text on Texas hold em poker tournament strategy, bar none.
Vol. 2 continues the greatness of Harrington's series by moving away from the formulaic, conservative approach taken in Vol. 1. This is understandable, since you have to learn to walk before you can run. And by the time you finish Harrington Vol. 2, you'll be ready for the speed trials! Words like "highly recommended" can be overused, so I'll just say you'd be crazy to gamble any serious amount of money without buying and completely absorbing all three of Harrington's books. You should also re-read them right before any major event to clarify your thinking. They're THAT good!
I'd also recommend The Poker Tournament Formula and Poker Tips that Pay: Expert Strategy Guide for Winning No Limit Texas Hold em for readers that are looking beyond the Harrington series, for additional hand-based poker strategies and techniques. Both books compliment Harrington's approach to the game quite well.