I used this book as a supplement to Sakurai for a graduate QM course. In undergrad, we used Griffiths but really flew through it, so I was lacking in understanding of some methods and concepts. Sometimes I struggled to understand Sakurai on my first pass, and this book was really a big help to me, specifically the chapters on time dependent perturbation theory and scattering. For undergraduate students, it has a nice intro on the history of QM as well as a whole chapter on the math and notation you need to know.<br><br>So, I think this book has something to offer for students just beginning to study QM at the advanced undergraduate level, as well as those who are in a graduate course on the subject.