Hey John,
The first two tapes I received were Memory Supercharger and Personal Genius. I listened to them over and over and over again. The result was I can still remember call numbers, and book titles from books I saw on the shelf at the library a year ago. I could photoread, and recall the entire page in my mind, a clear image of the page.
Do these work? Absolutely! Just relax, and enjoy. It will only benefit you.
Take care,
Matt