I know that the author a very important name in the CBT world. This fact made me buy this book. Despite the stellar endorsements from such giants like Aaron Beck, in my opinion, this book is not an essential read for someone who suffers from anxiety. It fails mainly because it lacks a clear step-by-step strategy.
Dr. Leahy tries to cover every possible anxiety variation: panic attack, social anxiety, GAD and so on. Each requires a somewhat different approach.
Author's goal for writing this book a bit confusing. It looks like he meant it as a self-help book. If so, it's not deep enough. If I, say, suffer from Generalized Anxiety Disorder, I would much rather prefer a book dedicated to GAD alone, rather than a book that lists a brief coverage of every possible disorders without giving me a clear step-by step road-map. Also, I'd require a book that emphasizes how to challenge the distorted thinking, which requires much more than a few pages. I felt lost in all the information without knowing what's essential.
The most helpful books on anxiety, by the way, already exist and it's very hard to top them. Please check them out: Anxiety Workbook by Bourne. This book also covers many varieties of anxiety, but is better organized. Another book, Mind over Mood by Padesky-mainly focuses on distorted thinking that causes depression, low self-esteem and anxiety.