This book was on the recommended reading list for my course (PGDip CBT) and was one of two books flagged as essential (along with Judith Beck's Basics and Beyond). This proved to be very true as it has been a practical, informative and accessible guide throughout the course.
The clear layout makes it very easy to dip in and out of as needed when time is short, and it sets out the most helpful conceptualisations and explanations at the start of each section. I found it helped me to understand some ideas that I was unsure of - it is certainly not a jargon-filled, academics-only tome.
I am certain that I will continue to use this book and would heartily recommend it to anybody looking to practice CBT with anxiety disorders (or any disorders actually, as it is helpful in terms of the overall process). If you are considering buying one book as a starting point for this reason, in my experience this is the one to get.