In terms of writing, the book rates only a three, but the information in it is enough to bump it to a four.
I have a terrible memory; I'm forever losing track of things, and long lists of facts challenge me. A friend was describing this book as he read it, and I thought it sounded worth the read. I'll admit, I didn't do it over thirty days; I worked my way through in a handful of hours. There are a few things I need to continue working on - primarily numbers - but the core lists of 10, 25, and 20 items, I have down cold. I memorized the US Presidents before the author set it up (I didn't have any lists on hand to practice work). To work on speed, I memorized the first 25 pages of a magazine, wowing my twelve year old, and then had her write down a list of 25 items that I memorized as she composed it. In short, with a lot of practice (and two massive headaches - be sure to take an occasional break), I feel confident I could memorize a list of 65 items easily and quickly.
If you knew me, you'd fall out of your chair.
The writing was stilted - he's clearly more of a speaker than an author - and the poem given to memorize was terrible. Although I did the exercise and feel confident that I *could* nail it verbatim, I don't want it in my head. I plan to try out some Shakespeare tomorrow. The message was clearly communicated, however, and not bad, the writing just wasn't great.
The information, however, was terrific, and I plan to use it frequently.