I recommend this to anyone more interested in quantum mechanics, science, and the history of science than the particulars of Mr. Feynman's life. I was a bit worried that it would focus too heavily on biography, or dumb down the science, this was precisely the mix that I wanted.
Mr. Krauss does an excellent job describing this complex subject to a numerate layman. He did such an admirable job, that I will definitely read some of his other efforts.