This was a really good book. It has some great insights and methods into how and why to prep for sessions. It's easy to read and understand. One caveat might be that it is somewhat loose, it doesn't tell you PRECISELY what to do but it does the next closest thing.
This book is solely about prep, and how to make prep more enjoyable. It's not about running a session or anything like that.
If you're looking for tips about prep, and want to find a good mentality and methodology around it, then buy this book.