The best parts of this book are the profiles of "cheapskates" (a positive term, as defined in this book) where you get to hear about how real people have been living using the values and techniques described in this book.
The author's style is humorous and generally entertaining while still clear and concise enough to make this an easy read.
Having said all of that, this book isn't particularly novel and I came away feeling like I hadn't really learned much. It was enjoyable, but not substantial. Some sections are already out of date (e.g. the sections discussing health insurance--an area which, for those with low incomes, is changing dramatically in 2014).
In the end, this is a decent entry-level book on (not-so-early) retirement. It is mostly personal preference, but honestly, I found Your Money or Your Life and MrMoneyMustache.com to be more engaging and profound, so I would recommend those instead.