Pros: Practical, easy to read, lots of pictures
Cons: Shallow short game coverage
In this book, Haney teaches a pragmatic two-plane swing. His approach is to focus on the plane that the club shaft starts on. He does not advocate the shoulders be on this plane and the pictures in the book show quite clearly that at the top his arms and shoulder angles don't match. It is definitely a two-plane swing, but quite a bit of his advice could be translated to a one-plane swing.
Haney gets a little less detailed in the short game than he was for the full swing. He talks about pitching and sand play too quickly, mostly focusing on the tweaks to your stock swing you should use for both. For chipping and putting he provides solid but somewhat shallow advice that seems more aimed at a beginner than at a moderate or decent player. (Don't get the book just for the short game advice.)
Swing-wise, he addresses almost every scenario. How to correct a slice or hook, how to deal with uneven lies, getting out of different types of sand, what causes a pop-up drive, how to choose the correct chipping club, etc. He does favor breadth over depth, though, and doesn't go into much depth on all the topics besides the standard stock swing, but he give guidelines for them. In general I thought his guidelines were good, but there were a couple that I think are at least up for debate.
He gives advice on everything, such as grip, alignment, foot flair, etc. He also talks about things that aren't directly swing related, such as tempo, the pre-shot waggle, and pre-shot routine. And it's not "take it or leave it" minutia, a lot is just general guidelines. None of it is mandatory for the rest of the swing, it's mostly just helpful thoughts and suggestions. For example, he doesn't really care about your grip so long as it isn't causing specific problems.
He knows the correct ball flight laws in this book. He states what causes a slice/hook and what causes the initial direction of the ball's flight. Throughout most of the book he will use abbreviated saying that, by themselves, sound wrong like "a slice is caused by an open clubface" but what he really means is "...relative to the swing path". In his mind, a slice means that your clubface alignment kept you from hitting a straight pull, so you have two problems to correct. It's a correct approach, just don't get tripped up by his phraseology.
A random comment: He teaches (somewhat predictably) that weight shift to the back foot should naturally occur as a result of the shoulders getting behind the ball on the backswing. I don't like that advice.
I think he does a good job explaining the things he tries to communicate. There are plenty of pictures to go along with the text, including "do" and "don't" examples. I found the content easy to understand.