Rating: 
Summary: Not enough information
Review: This is the worst book I have ever used throughout college. A person who has not had Quantum Mechanics would not understand it by using this book. It does not provide enough examples nor explanation. Certain topics are not discussed in detail and there are some topics that are not discussed at all. Where is the background information? This book needs to be discontinued!
Rating: 
Summary: Needs more examples!
Review: While the overall tone of this book is quite engaging, the major flaws are a lack of examples (Dr. Griffiths enjoys having the student figure out things on their own without them) and no answer key.
Rating: 
Summary: Recommended for some, strongly discouraged for others
Review: I first saw this book as a graduate student. Some fellow students had used this book as an undergraduate text. With all due respect to said fellow students, they have barely the ability to articulate the most simple statements of Quantum Mechanics. If you're goal is to have a basic understanding of the machinary and principles of Quantum Mechanics, then buy either Liboff or Landau. That being said, I could see how this book could have its uses. If you A) do not understand linear algebra. B) do not understand differential equations. C) have fond memories of 3rd grade math. D) would like to impress your friends with the uncertainty principle. then buy this book.
Rating:
Summary: Fine, clearly written introduction
Review: This is a well-written, beautifully done text for beginners. Though not a brilliant book like Dicke-Wittke (which sparked at every page and, alas, is out-of-print), it brings the message. Besides the more usual topics, I particularly liked the treatment of adiabatic processes and the Berry phase, which is the best I met in textbooks. The exercises are effective, and vary from routine to tough. I've met at least one which slightly strains, in its wording, the laws of electromagnetism. But I liked to teach from it, and, better, the students loved it. I wish I had a text like this when I fought against old Schiff, centuries ago!
Rating:
Summary: Waste of money
Review: This text is much like Griffith's intro to electrodynamics. If you don't need to learn anything, and just want a simple answer to basic questions, buy this book. If, however, you are taking a class in quantum mechanics, don't waste your money. Griffith brings up interesting questions without ever answering them. He offers no assistance in solving the more demanding problems which would aid the learning process. If you're majoring in physics stay away from Griffith as a whole. Rholf is a much better publisher and writer. Check out his texts if you're serious about an education.
Rating:
Summary: A really bad book.
Review: The book has a few good parts, but there are just too many flaws to grant anything higher than one star. Griffiths leaves many important steps out, sometimes leaving them to the problems or just not covering them at all. Some topics are covered too briefly to be of any help. This book seems to be popular among some students because of his informal writing style, but they should be more cautious. Many professionals I have talked to agree that this is not a good book to start learning QM from. There are many good books out there that you should consider before getting this one (if you have a choice).
Rating: 
Summary: A very nice book.
Review: I hate books which put things more difficult than they really are. This is not such a book. It gives the reader an clear, consistent and very readable introduction to quantum mechanics whithout the usual pooha and bigtalk. Griffiths is precise, not overly detailed and in my opinion a huge didact. He also wrote an introduction to electrodynamics which I found of the same quality.
Rating:
Summary: Rather disappointing
Review: At first, the easy going style appealed to me. When I began reading other texts, such as Liboff's excellent 'Introductory Quantum Mechanics', I realized the shortcomings of Griffiths. The maturity level of the book is horribly inconsistent. For instance, there is NO formalism presented regarding representations of operators or on the ideas of an abstract Hilbert Space. But when it comes to scattering, he uses contour integration, an approach not even used in the more formal Cohen-Tannoudji text. It is interesting to also note how Griffiths wastes an entire chapter on the variational principle (a subject left as an exercise in Liboff). It should be noted that a student should learn, at some point in his/her undergraduate career, how to read more formal material so as to have more difficult subject matter accesible in further study. Griffiths book does not accomplish this goal as a student who has had only this as a foundation would be at a serious disadvantage when confronted with standard texts in relativistic quantum mechanics or quantum field theory. A first course would be much better off with Liboff augmented with Feynman's third volume and perhaps some Cohen-Tannoudji. Griffiths would make good bathroom reading.
Rating:
Summary: How to reduce work on the problem sets
Review: After reading the other reviews on this excellent book, I would comment that the exercises can be reduced to short work by use of Mathematica to run the integrations, etc.
Rating:
Summary: A well written elementary QM text.
Review: David Griffiths concentrates on the classic and important QM proplems, such as the Schrodinger equation, the finite square well, the delta function potential, the hydrogen atom, spin, etc. He does not touch on QM "side line" issues. Thus the students efforts are most efficient. Griffiths develops each subject in a balanced and easy to understand way. His book could be home studied without assistance from an instructor, which is certainly not true of many QM texts. The exercises are well selected and appropriate, and many of them have implicit or explicit answers provided. Along with QM by Claude Cohen-Tannoudji, I would rate this one of the best choices for the beginning student. While Cohen-Tannoudji is comprehensive and elegant, Griffiths is basic and focused.
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