End-to-End QoS Network Design: Quality of Service LANs, WANs and VPNs was another book I bought for the CCIE preparations (but never read until now ;)).
Since I’m busy with a QoS design/concept for our company network (amongst other stuff) I was haveing a look into different Design books/pdfs/documents and was guided to the official Cisco Enterprise QoS Solution Reference Network Design Guide. And well It seems to be the exactly same as the book itself. Except the books Chapter II (QoS Toolset), which handles the different QoS Tools and explains them into more depth than the Guide which only gives a brief overview.
So before you think about buying the book, you probably should have a look at the free Cisco Design Guide if you don’t need an in depth explanation of the QoS Tools 🙂