I bought a zibits set for my four year olds birthday. He and my older children (6 and 8) love it. It is quite durable and clicks together well so doesn't fall apart when being used (although you couldn't pick the whole thing up and move it). My children love scattering the cubes of rubbish around the floor and gathering them up with the remote control robots. I do think the issue mentioned by other reviews about the frequency the remotes work on is a serious problem though. I bought two robots and was lucky that they can be used together, but would have been furious if they clashed. The issue is not that some robots are not compatible with others, the problem is there doesn't seem to be any way of knowing in advance so that you can choose to by compatible ones!!