To be sure, there are gems in the book, and I learned a few important points, but I have been to ScrumMaster certification training, read two other agile books, and been mentored by a CSM/PMP. I feel the book only moved me from 80% comfort level with Scrum to 85%.
If you are a consultant managing projects, or you want to teach, coach or train in this area, read the book. If you a internal project manager,product manager, or IT manager, I recommend you get Agile and Iterative Development: A Manager's Guide and read the section on Scrum. It's simpler, cleaner, and the rest of the book gives good background to agile and options you may want to consider.
If you are a team or development lead, or the senior developer, get Agile Project Management with Scrum. It's an even easier read, focused solely on Scrum and gives lots of enjoyable stories of real situations the author went through, good and bad.