I bought 4 Hour Body and 80/20'd it. I figure I learn the 15 minute female orgasm and who needs the other 80% of the book?
Seriously, this book was an excellent, quick marketing lesson. People buy a book or product for the 20% that applies to them. This is why Tim's books appear to be disjointed bits of information on seemingly rather random topics. He's simply collecting the 20% of information that appeals to different markets and compiling them so that Group A buys the book for the 20% that appeals to them, Group B buys it for the 20% that appeals to them, etc...
Very smart way to put an info product together. It changes up my strategy for something I've been working on the past year.