The book is produced as an "eBook", delivered in a PDF format with the book examples available in a zip file.
The book is written with the experienced developer in mind. It's all about getting productive as quickly as possible. We've all been there, thrown into an unfamiliar technology and expected to perform miracles overnight. In these situations you can find yourself floundering, looking for some starting guidence while you try to find your feet.
Having said that, if your just working with Ext JS for your presentation interface, the book is complete enough to get you up and running.
After an obligitory introduction chapter, and some foundation concepts, your quickly working with Ext widgets. Very soon your creating Ext JS forms, applying textfields, datefields, combos, toolbars and validations. The very popular Grid an Tree components are also well covered, with Layouts appearing surprising late in the book.
I enjoyed the flow of the book, which is written in an easy reading light hearted style. The examples clearly explained the concepts, and raised a few chuckles at the same time. Examples that included server-side code assume a PHP backend, a fairly typical implementation for Ext JS.
I work with Oracle Application Express and PL/SQL, never the less the examples were easy to follow if you focused on the format of the server output rather than the implementation language.
Overall, if your starting out with Ext JS, or struggling understanding the Ext JS examples and scattered forum posts, this book is a good reference.
Chapter 7: Layouts is available as a sample chapter.