Very interesting. Very helpful. But a bit mind-boggling.
Key thing that is missing is how to put your opponent on a hand. Starts a lot of scenarios with "say you put your opponent on a small pocket pair..." or "say you've put your opponent on AQ or AK..." He doesn't offer a lot of direct help with how to do this (admittedly, this is something that is not super teachable).
Here's the thing: reading about how to do better at something like playing poker is more boring than counting to a million; if you can get past about 600 or so without skipping a number or stopping, then congratulations, you're a calculator. And if by skimming this book and not finishing it I do worse at playing poker, then I'm okay with that.