When I hear about auto-mowers, always think of that Jerry Lewis movie that had those in a yard and they chased the bad guys around and eventually were eating at there rears! Looked like electric shavers! That was Long ago! SO, how can these be safe if not a perfectly flat, clear yard? They see and drive around things? Bump into them and just go another direction like those vacumns now out? Can they really mow in a complete pattern? What about things in way, toys, dogs, kids? I don't get it. What kind of speed for these? This stuff Osha approved?? Just don't seem right to me.