I purchased this textbook to use in a graduate-level introductory course on quantum mechanics and have so far found it to be a great book for taking a more in-depth "introduction" to the subject beyond the graduate level. I think that starting with the Dirac formulation of quantum mechanics as exemplified by spin is a better way to introduce the subject than beginning with wavefunctions and Sakurai/Napolitano do a great job of explaining the concepts for students of all levels.