I bought the Kindle version of S&S on Wednesday. I really like the emphasis on power and strength. I don't know if this is a refinement or evolution of the original ETK, or if I am just now starting to understand Pavel. But, gradually, I think I am starting to understand Pavel and Strong First. I think anybody, from youngster to geezer, would profit from S&S.
BTW, the TOC is hyperlinked.