Both Terry Doyle and Todd Zakrajsek have written other books about learning, at least some better than this one. However, by focusing on how to get the brain ready and able to learn this book does add something to the literature on learning. The book is also written for a student audience, which is a bit different from most.
The book claims to be about "how to learn in harmony with your brain." This statement made me think that it would discuss cognitive psychology and the evidence-based learning strategies that arise from this research (such as spacing, interleaving, retrieval practice, elaboration, dual-coding etc.). Although the book occasionally refers to these topics, especially spacing and elaboration, the focus is really on the "physical" side of the brain. That is, the book focuses on the importance of sleep, nutrition, and exercise, as well as the importance of paying attention, using multiple senses, seeing patterns, and fostering a good mindset (growth mindset).
These behaviors may seem trivial and perhaps obvious, but I don't think it is to our students. Hence the book serves students well in that even the best learning strategies will not prove effective if the learner is sleep-deprived and in poor health. So, in the end, this short book does serve a good purpose. [I would say that Tood Doyle's 2011 book on Learner-Centered Teaching covered most of the same topics very well. That book, however, was written for teachers.]