The beauty of this book is it's simplicity and practical examples. It is so easy to understand and to follow it's instructions, that you will remember and recall a lot even when only speed-reading it.
Downside for me as an European citizen are the US American examples used to impress the techniques onto the reader's mind. Well, I think there is no harm in learning the date and Beginning of Lincoln's Gettysburg speech.
The reason for me to buy this book was that I wanted to find an easier way of learning long texts. He the book was a bit short. However for general memory improvements and great techniques for learning and remembering numbers, names and directions this book proves to be a treasure chest!