This book is great, mostly because the text does not assume you know anything about computers, mainframes, or JCL; and groups the lessons on these subjects in order, so if you already know about a level of information, you can skip it and go on without loss.
The book explains everything it touches on in great detail, but doesn't explain all the obscure and rarely used options (a great benefit when learning an new language).
A section is included on the basic MVS utilities, but this is the one skimpy section of the book. Some of the utilities are underexplained (although the basics are fairly clear).
I never regreted the money I spent on this book, and I recommend it even today to people I meet who want to learn JCL (or even just more about the basic MVS environment).