Ferriss strikes me as one of those highly intelligent, highly capable, and highly energetic people who overestimate their understanding of how they themselves became so successful.

I tried the method Ferriss describes in his book. One of the things he really stresses is testing your idea before you invest. When I did this, I found out that none of my business ideas were viable, although some were close. The total cost to me was tiny, and I learned something valuable: my business ideas weren't good enough. Everything Ferriss actually said was valid (in my experience) but the problem is in the thousand little judgements you have to make. Most of us probably don't have TF's competence, and that really isn't something you can learn in a short book.