This is one of the best math books I have ever read, and I did read all of the chapters of this book. One of the ways I assess a textbook is by how much understanding I gain. Many math books follow the form "Here is an equation and here is how to manipulate it" with no motivation for why it's this way. Every page of The Calculus Lifesaver is packed full of insight.
Every example felt like the author put thought into how it helped you understand the concepts. While some of the examples used are standard, and really need to be in some cases, many others were much different than what I have seen in other calculus books. In fact, some were complex enough that the author needed several pages to explain them.
So, as much as I love this book, I would not necessarily recommend it as a first book on calculus. There are no end of chapter problems and I do feel that to learn math you need to spend a lot of time working problems. Even then, the book is about 700 pages long. Also, some of the examples are probably too hard for most people seeing calculus for the first time.
While I do believe that understanding should be promoted when learning math, a person has to know some things in order to understand other things. Therefore, I think this book is better suited for either a second pass through the topics or as a supplement to a more traditional book.
My final comment is that I think I only noticed two typos in the entire book, and they were in the text (i.e., not the equations) and therefore fairly easy to spot. This shows the attention to detail that the author put into the book.
Note that I believe (and follow) the meanings Goodreads gives for what each number of stars means. Therefore, the majority of my ratings are 3 stars ("liked it").