This is an enjoyable, pleasant read about collaboration that manages to be rooted in empirical evidence while still being accessible and brief. I wouldn't say that much in this book is particularly ground-breaking if you are familiar with the literature on collaboration, but the authors are academics who have contributed to that literature, so it should come as no surprise. You can expect the usual array of platitudes and motherhood statements in this book (as in all books and articles about collaboration), but after these platitudes there is always practical advice.
I would say that this book is best for practitioners from agencies and community groups, rather than academics. However, there are plenty of academic references for scholars to pursue if they want to know more. If this book would have had a tight, clear summary on the conditions required to support effective collaboration, I would have liked this book even more. I think that's merely a product of the messiness of this research space. It's really difficult to make sense of all the noise by looking at all the many different contexts and approaches in which collaboration was successful. I think Wondolleck and Yaffee did a great job of minimising this noise, however, and have created a really useful resource for natural resource managers.