This is a great tool to help you get out of a description rut. As any writer knows, it's all too easy to fall back on the same handful of emotional responses (my characters "sigh" so much they have breathing problems).
This book is essentially a list of physical and visceral reactions to the most common emotional responses. I find that it's a great brainstorming tool. Obviously it isn't meant to provide "exact" phrases you would use in your writing. It's more like a springboard to help you visualize your own characters and how they might react in ways you hadn't thought of. In that respect it's an excellent resource. My characters are much more three-dimensional and real as a result of this book.
It IS a bit limited and the lists are a little repetitive. Granted, emotions like anxiety, fear, and dread overlap, and so do normal responses to those emotions, but a lot of the things listed are very generic, making it easy to loose the subtle nuances between those words. However - that's the WRITER'S job, not the thesaurus author's job, so I can't fault the book too much. I just wish it had more emotions listed than the basics that are covered.
But overall it's an excellent resource and one I reach for whenever I'm struggling with my characters. I also reach for it whenever doing an editing pass, mainly as a way to make sure I'm not in a descriptive rut without even realizing it. My writing has definitely improved with use of this book and I plan to purchase the others in the series.