I've seen 2 of these mowers around, and actually one of the owners became a customer of mine for 5 years, while the other I would edge and trim for, as nobody has figured out how to get the mower to do those jobs yet. These things have barely any power, you really need to have them running daily to actually cut the grass. If someone stole one, it would 'run away' as you have to bury wires around the perimeter of the lawn (like an invisible fence) so it knows where to stop. This creates problems...the guy I edged/trimmed for, he didn't want to have his driveway cut into to bury the wires, so he basically had each section of the lawn with the wires surrounding it, then he had to pick the mower up to move it from section to section. It's one of those inventions that sounds good but as the technology stands now, I don't see many people bothering with them.