I purchased this book to provide good background information for a simple seminar I teach within my company to provide information to inventors.
It is written to provide high level explainations of legal concepts as well as more detailed case law. What was most benificial to me was the section offering example cases and opinions.
This is far beyond what anyone can learn by searching the on-line resources such as the USPTO website and hence very valuable. It is written in a simple and easy to understand way and arranged to get to the information you need quickly.
I think this is a good book to have for lawyers and business people involved in IPR alike.

I had a Copyright class this past semester. My book was organized very differently from the supplement, so it's not like the information isn't there, you just had to dig around to find various things that corresponds to your text. Also, since the supplement covers all IP subjects, don't expect a real in-depth treatment in any particular subject.