The following review was written by Ben, one of my 4th graders. He has used this book in class to build some of the robots:Pros: cool robots, nice designs, easy to find most piecesCons: Takes a while to build them, sometimes they don't workThis book has very cool robots but I don't like the directions because it just shows you a picture of the how it is supposed to look, but doesn't give step by step instructions. My favorite robot is the Sumo Bug. This robot is basic and cool. This book includes 10 robots including the WideBot, Sumo Bug, hopper, HunterBot, Nessie, Nellie, Domino bot, Draw bridge, Candy Wrapper Compactor, and the Robo-Hominid.All of the robots are fairly easy to build. You will find most of the pieces easy to find. However there are some pieces that might be hard to find. On the Widebot's base you will need a piece that is not included in the blue Lego Mindstorms 2.0 kits. There is also a piece on the grabber motor on the Hunter bot that does not come with the kits. Over all I give this book four stars.