1. It's like a friendly conversation as you read it.<br>2. No errors! No typos! (So far I haven't found one)<br>3. Thicker paper and good ink.<br>4. Hundreds of problems in each chapter.<br>5. It beats Shankar, Ghatak, Sakurai, Griffiths in the presentation. Try the same section in all these and then try it in Zettili, you'll discover Zettili is always somehow better. (I don't mean Shakar and others are bad, I mean, Zettili is better)<br>6. It is in Latex!<br>7. Extensive Index.<br>8. Awesome graphs.<br>9. Remarks at the end of sections give you an out-of-the-box perspective.<br><br>It seems like the book has evolved through lots and weaning and addition. Somehow it is perfect.