I heard this as an audiobook on Hoopla, and it's an odd experience. The book "reads" (listens?) like a textbook. I can practically see the definitions with underlines--"is this gonna be on the test?", and imagine highlighting from the dim-witted undergrad who owned the book before.
I confess that most of what was in the book was not new to me. But it was nice to see it laid out clearly, and to get a refresher on the importance of things like analyzing reinforcers. As an owner of an intelligent, tricky dog, I have to stand back every now and then and ask why I am expecting certain things to work, or why my dog is misunderstanding me. This book, as any good book on dog training and behavior, will force you to analyze yourself, not just your animal.
But it's not a how-to book, and it should not be approached this way. It is clear and fair. I liked the nuance it exhibited in the coverage of tricky issues like punishment, and in explaining negative reinforcement (which, as any good behaviorist will tell you, are not the same thing). For punishment, the book raises questions that it doesn't always answer, like "would you use punishment on a dog who has taken to herding deer, if the alternative is the dog accidentally getting shot by a hunter?" I mean, yes, I guess I would, but you also just told me that punishment is slow to work and not nearly as effective as positive reinforcement, so why even ask? Or how would you deal with this situation if you had to?
One interesting aspect of the book is that it strives for the golden middle. Trainers who use only punishment and "break the dog" in order to get obedience are portrayed as extremists, but so are trainers who refuse to use anything but positive reinforcement are portrayed as extremists, although the criticism of the latter is more veiled.
There was one howler, early on, having to do with the evolution of dogs. The idea that "cavemen" domesticated dogs by bringing wolf cubs in and using behaviorist tricks on them has been thoroughly debunked and is frankly idiotic. If you read that passage and did not bat an eye, you need to read some books by Raymond and Lorna Coppinger.