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This book is not for beginners, to understand and appreciate it you must have made at least one project with Symphony2.
The book presents code examples mainly, very clear, that can be safely reused for your own projects.
The ultimate goal of the book is to create and distribute your bundle, but each chapter can be considered separately, and each can help a lot to improve the way to implement functionality in Symfony2.

I especially enjoyed the chapter on Commands and how to set them as an interface to Services, because, as written by the author, opening a terminal is already a technical operation for many people, and having a web interface for starting the process that the site admins could use is very powerful.

The other chapters that I liked were the one on Doctrine, on how to use with MongoDB and coordinates, and the one on Twig and how to implement a widget for a map.

I recommend this book to anyone who wants to deepen and improve his knowledge of Symfony2, and who wants to better understand the logic.