This book reads like a reassuring letter from a close friend. Oh dearest reader, what you've been fantasizing about isn't as weird as you think. In fact, my love, I think it's wonderful and I'm so proud you're finally admitting it to yourself!
This book doesn't have much to offer someone who is already comfortable with the thought that his/her sexual desires involve submission.
The authors describe what goes on in the minds of bottoms (like to submit) and tops (like to control). They offer a lot of commonsensey stuff about negotiating your limits before a scene (the authors suggest using email, for instance) or negotiating, more carefully, when you're in-role together. The authors discuss some of the decisions you'll have to make as a bottom (like to what extent you'll want to maintain your role out of the bedroom) but the authors tend to throw out a cursory list of possible options, offering little depth and experience.
Even as someone with little experience, I was still disappointed with this read. It was too superficial, too "supportive" (I am not ashamed!), too obvious (i.e., communication is very important).
I think this book is best suited for people who've fantasized about bottoming but aren't sure whether it's what they really want or how they can get started doing it carefully. If you don't fit this description, and you've found a better book, please post is a comment here so that we can all read that one instead! Sorry, authors.