My brother has a few, super super fast and his dog will chase it around. He races them sometimes. Pretty cool.
I have one, grass hopper model somewhere in my basement, that my neighbor gave me so we could tape beers to it and zoom it back and forth between our houses .. but its been bogged down in the planning committee stage for years now and likely never to be acted upon.
I am into remote controlled life like snakes though. Thats my jam. I dont have one yet but I really want one.