This book is awesome, Doesn't matter if you're just beginning on UX, or if you're a Senior in the field, Wireframing Essentials teach/remind you how to plan, design and program a good User Experience, Every one of the chapters in it, Is a precise, centered and effective methodology to achieve the quality and requirements of any project you're working on.
Reading this book, even with a lot of years of experience, you have a lot of "Mmm... that make sense" moments, even more if the chapter that you're reading, match with an existing issue in your current project, this book will help you to fix/foreknow any kind of issue related with you UX, which is very important, anticipate any negative impact on the user. because after all, a good UX is like a joke: If you have to explain it, is not good enough.
Wireframing Essentials is a very complete book, but nothing boring, is not the typical book with definitions and tedious processes that at the end you know everything about some topic, except how to implement it...( duh! ), Wireframing Essentials explains with a very complete example from beginning to end, what is the ideal process to have a great UX Design, doesn't matter the role or final user of your project.