i've been doing it for about 3 years. I also have his cd.
the cd just shows him doing the exercise, and also shows him doing the advanced excercise. I bought the cd, cause I thought he earned my 25 bucks, by showing me how to flex the occipitalis muscles.
I do it twice a day, one of the times, on a slant board.
I had a bunch of transplants long ago, and I began doing the exercises just to see what would happen, ie, if I'd get any additional growth. And I have, but the main thing about it that I like is that the hair itself becomes much stronger. Especially when doing the advanced exercises, which you give resistence, as you do the exercise.
It is also good for sort of sculpting the muscles in your face, bringing out the cheekbones and tightening the forehead.
You don't need the cd to do it, and it's free, and the thing is, you have to do it for years so see the change. It's very slow going.