Time has not treated this book well. As robotics develop further and further w/o any regard to the three laws, it becomes more and more of a series of logic puzzles and less of a work of science fiction. That Asimov feels that humans might one day be better ruled by benevolent AI seems almost quaint and childish w/ a half century of robotics research being directed towards developing new killing machines. It is a fun read and a must for fans of vintage science fiction but it is simply no longer the landmark it once was.