The first half is multicast theory and descriptions of how the protocols work and is vendor agnostic. The authors pull no punches when it comes to how it actually works in the real world, which I like.
Next is a section on how to configure the protocols on a Juniper Networks router. It's followed by a similar section on how to configure a Cisco router. The two chapters show how to configure similar features on the vendors' equipment. There is no performance testing nor discussion about capabilities of specific revisions of code, which I also like. Any attempt to do that would make the book quickly become outdated. I believe these types of issues are best discovered in a lab, not in a book.
All of this is followed by a detailed service provider implementation case study. I liked this part the best. It includes configuration for both vendors' routers.
Finally, there are some good detailed appendices.
Certainly you can pick up some good information in the configuration examples that may be useful outside of multicasting. On the other hand, the book itself is entirely focused on multicast traffic and protocols. I read it for fun which should give you an idea of how interesting I am to talk with at parties.
Hope that helps. I highly recommend it!