I've never read the book but searched for it on Amazon, "8,283 of 8,919 people found the following review helpful":

http://www.amazon.com/review/RKBQAAIIRUO5X/ref=cm_cr_dp_titl...

"(1) It takes more than 4 hours a month in the gym to have a great body. I'm sorry, it just does. Mr. Ferriss recommends performing 2-3 SETS, for a total of less than 30 reps, per WEEK, to get a great body. Ask any athlete, bodybuilder, trainer... not enough. Not even close."

"(2) Almost all the supplements recommended in 4HB have never been scientifically proven to do what Mr. Ferriss claims they do."