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Update: since 2016 I read this book 5 times while running and participating in 10+ design sprints. Every time I see something useful and inspiring for the next sprint or workshop.

Review from 2016:
This book describes how to run 5 days sprints for rapid prototyping and user testing of the new and existent ideas. If you are following scrum and user-centred design methodologies the contents will not be completely new. However, this is a really good, humorous, not repetitive and to the point guide to the product vision development.
The book also features checklists (can be found on the book's website) for every day of the sprint, so you don't need to take too many notes about the process.
After finishing this book I'm really eager to try it together with my design and scrum team.