When you're doing the deep dive into MsBuild or Team Build, especially around extending the existing build process, this book is a must have. Even though there are a few great examples in here, I regard it mostly as a reference guide. If you want practical examples on how to extend the build process using existing content, then I strongly recommend the ALM Ranger Guidance on Build Customization as well. They make a great combination.
The first half of the book, on MsBuild, should be read by all .NET developers so that they actually understand the way the project files in Visual Studio work, how they can extend the build processes with simple hooks, such as tasks and post build event efficiently.
The second half of the book, on Team Build, I found a little harder to place. A team working on Continuous Integration and Deployment surely will benefit from the knowledge on the Workflow engine, but newer items such as MsDeploy and Azure aren't covered at all. So it's mostly a theoretical business. Having a firm knowledge on Workflow Foundation and Xaml is really helpful in this area as well.
All in all, a great book, a great reference. Combine it with the Microsoft ALM Ranger guidance for Build Customization to have a complete picture.