I've been an agile developer since, well, before there was a manifesto. I've been Apache Agile, Extreme Programming Agile, and, nowadays, on my team we use Scrum with all the trimmings.
Sutherland's book is helping me gain a new respect for Scrum, and also helping me see some places where our own practice can be improved in small but significant ways.
The book is full of hard advice and riveting anecdotes, including how the FBI uses Scrum to keep us safe, and how Scrum brought us ATMs and prescriptions by mail.
A key theme of the book is that Scrum isn't just for manufacturing or for software, it's for planning and managing any process subject to constraints: Weddings, Black Ops teams, Frontline News Correspondents, Home Improvement Contractors -- you name it!
Best of all: Sutherland's book is totally boss-friendly. If you have, or you are, a manager, CTO, or CEO that doesn't really get what Scrum is about, but would be willing to learn: this is the book to read first.
Or, if you practice Scrum yourself, and think you know it all, trust me, you don't.
Newbie or not, this may be the last Scrum book you ever need to read.