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I know this is primarily a kids book, but I still enjoy it now after several years of first reading it. It's not only a fascinating story of a very well-thought out universe of the future, but a very interesting moral and spiritual investigation of "conscious machines" like robots. Rex is a very good and sometimes funny narrator, and, as a robot, he has a unique point of view. I must admit I never thought of many sci-fi space stories from the intelligent robot's point of view: it's quite fascinating. There were part when I laughed out loud,and towards the end, after Rex has been cornered by the police after deciding to give up his life for his master, I almost cried. (When I was 10) :) This one really does need to be read to be appreciated.