My hubby got this last year for Christmas and after 3 replacements in about a week's time, we gave up on it and got our money back. While it did very cool things--for the $100 price...the few troubling nuances that were wrong with each machine is why we kept returning them. Otherwise, my over-30 hubby enjoyed playing it...however, we did download command tips from the internet so that he could get the robosapien to do what he could do as advertised. He's an engineer--and these commands take a bit to attempt and then take a while to learn them so that with assistance of the instructions, to perform them with ease.
It is very difficult for young people to control--many commands, many simultaneous buttons needing to be pushed to get him to do things.
It is a very cool toy--but for a 5yo may prove to be a very frustrating and hated toy if he cannot reasonably operate it.
JMHO. Good luck.