This is probably the most practical book there is out there on the subject of JBoss. Some other books are basically a re-print of on line information.If you are especially a new JBoss user this book is for you. The on line documentation seems to be too advanced for beginners.That doesn't mean that this book only covers the basic. Once you go through this book you'll have a solid foundation for the basics and some of the advanced topics as well.I think the authors did a great job. And it is true that they did their best to respond should you have questions.