Following the spirit of the name, this book is very easy to access and quick to read. It is an excellent introduction into the basics and the absolute fundamentals of the LSAT. However, with simplicity comes lack of depth. Though the authors mention this several times, I must reiterate: unless you are very talented at logical reasoning and test taking, this book is not remotely comprehensive enough of a resource to guide you to an acceptable LSAT score. Even the three included practice exams are quite easy. The four star rating is only given assuming you're looking for an intro to the LSAT.
The book has surprisingly few errors (all exam prep books have errors, it's unfortunately quite unavoidable) and the errors are, for the most part, obvious, small, and therefore, easy to forgive. I think it's best to start your LSAT journey with this book, read through it quickly to gain a reasonable understanding of what to expect, do the practice exams, and move on to more intense and detailed exam prep books.