This is a different type of agile book, free of process prescriptions and full of little stories that illustrate actual examples of being agile. If you like to learn from lots of little stories, this is the perfect book for you.
The author ties groups of stories together into "mantras" like "Be Quick - But Don't Hurry", "Drive Out Fear", and "Be Poised to Adapt".
The author is a well-known technologist, consultant, and speaker, and most definitely knows what he is talking about. I concur with his overall premise that those who promote "Agile" have lost their way a bit and often times focus on things that do not drive true agility. Each of the examples the author provides here give examples of true agility, not a fixed framework that you must follow.
These mantras are principles to follow if you want to improve your agility. The mantras are consistent with many of the principles I have used within my organizations and with my clients, so I am in full-throated support of using them as a guide.
The author also pulls in content and advice from many other well-known authors in the field, so you are also benefitting from a wide collection of tried and true advice.
My one small nitpick when reading the book is that the stories were in fact very independent and despite the organization into mantras, there wasn't a great deal of cohesion between the stories. That shouldn't take away from the value one will get from reading the book, but based on hearing the author speak about his book, I thought that cohesion around the mantras would be more pronounced.
All in all, a quick read and one that I think offers many nuggets of behaviors and practices that we should all consider adding to our repertoire to help us reach greater levels of agility. I would say it is a must read if you are interesting in true agility, both for its content and the approach to agility that we don't get enough of in most of the agile how-to book genre.