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This book explains the ideas clearly and concisely, with a really deep physical understanding of what is going on. As an undergraduate studying QM I found this aspect of the book incredibly useful - I have yet to see another book that gets to the heart of the subject so well.
The book is short, and a bit brief in places, so I don't think it would be possible to use this book alone for an undergraduate course. However, alongside another more comprehensive book this is truly invaluable in deepening your understanding of the subject.
Unique approach taken by Paul C. W. Davies and David S. Betts , authors of the book.
The book tends to be terse and requires that the reader use his or her imagination, at least for the first few chapters.
The mathematical treatment is kept to a minimum in the first few chapters but becomes intensive as well as deeper with the progressing chapters. Examples are kept at a level of simplicity to avoid confusing the reader or student. The Schrodinger-oriented wave approach is treated basically throughout the book though more heavily in the first several chapters, whereas the Heisenberg-oriented matrix mechanics approach is treated with some degree of emphasis in the second half of the book. As always, the treatment is kept fairly terse and rigorous but not by any means "overdone" with details or verbose with difficult and profound arguments.
The only problem, if one calls it that, is the relatively conservative approach with fewer diagrams, schematics and pictorial illustrations compared to modern textbooks. Perhaps it reflect the British educational ethos prior to the 21st Century. But since the examples and concepts are so well treated and explained in simple language without "overdoing", due diligence on the part of the reader (or student) can readily make up for any perceived deficiency in illustrations.
All in all - a nice "lean" book to either study (including self-study) or review Quantum Mechanics as most topics are kept as simple as possible in treatment, although I suspect the book was never intended to be a formal textbook or any kind of heavy pedagogical work to impress the uninitiated student or newcomer to the subject, which forms one of the foundations as well as building blocks of modern-day Physics.