The section on range-oriented thinking is worth the price of the book alone. Too many low stakes players play with a weak polarised range and this may, funnily enough, be an optimal strategy at such stakes. But as you move up even to the small stakes ($100 buy-ins), polarised ranges are easy to exploit. This book gives a roadmap for range-oriented thinking.
The book then deals extensively wih pre-flop play, including a very analytical incorporation on equilibria. As an economist by training, it was refreshing to see how Nash Equilibria apply to poker. The most interesting part of this part of the book was on perceived ranges and how to manipulate it to facilitate value betting.
The section on three-bet pots is nothing new, but it is useful to see another perspective on it.
The penultimate section covers miscellaneous topics, most of which offers no major insights, but I did absorb some new material on optimal bluffing.
The final section includes hand reading exercises, combinatorics exercises, range structure exercises and optimal bluffing exercises. There are some very difficult exercises here, and that's why the final section is very useful.
For 14 quid, this book is being given away.