This book contains some great tips and advice for those looking into graduate applications, whether a masters, doctoral, or professional degree course. The most valuable part of this book is indeed the example essays that are quality, but it also provides some great tips for preparing your drafts and then editing them.
While the general advice/tips on the application and admissions process is good, I highly recommend "Getting What You Came For" by Peters. That book is a complete reference on the application and admissions process, but also what to do once getting accepted and how to make the most of your time in your program (potentially speeding up your coursework saving you time and money!!!)
If you need ANY tips in the writing process, BUY THIS BOOK.
If you need any OTHER tips, buy "Getting What You Came For"
If you can, BUY BOTH! These two books are WORTH your time and money.
Good luck with your applications!