Sakurai is a great book to lean a graduate-level quantum mechanics. As everyone knows, the book was not entirely written by Sakurai (only the first three chapters were completed), but completed by his friend and colleague Prof Tuan after Sakurai's untimely death. The first edition and revised version are very good. It contains absolutely enough modern materials for a typical quantum mechanics class such as the quantum measurement, quantum correlations, Bell inequalities etc. In brief, the third edition (a strange new co-author is added) is totally unneeded and has not made the book better!