Its a great book to learn the EJB 2.0 specification / model! The pictures / diagrams inside the book help illustrate how the entire process works with the EJB container. I am learning a lot from this book. The coolest thing about the book is that its the study guide for the SCBCD exam and the authors make that clear. They focus well on exam objectives and its apparent that they want the readers to pass the exam. The only thing that this book lacks is appendices for different application servers such as WebLogic,
JBoss, & WebSphere. But hey, you have to remember, those are separate certifications, in themselves...
All the best,