This text book is an excellent and thorough undergraduate introduction in Quantum Mechanics. It is well written and contains a lot of examples. The mathematics is sometimes at a high level but never too abstract. The second edition contains even a brief discussion of the Feynman Path Integral formulation, an extra chapter about relativistic QM and extensions in QM Interpretation. This makes the introduction complete. Why not five stars? Because I believe that even an undergraduate book should contain some elements about Hilbert space and the very important spectral theorem. It is a little pity that the authors do not mention these subjects at all. But apart from this remark, the book is really excellent.