From an animator's point of view, believe it or not, Osipa can get you to model and rig. I know- unbelievable. It is true. He also has a bit of humor to his tone and explains in a well-rounded way.
This book is a must for anyone learning about facial anything, as it pertains to computer animation software- even traditional animation! In addition to modeling and rigging, Osipa also gives some super simple but super solid principles of lip sync. This is part of the well-rounded approach. He explains why and how to build something that will work for an animation style.
This book is irreplaceable. Though I have "Read" it, I will continue to read it in spots for years to come as a great resource.