I so need one of these! Oh, wait, no grass to mow. But you probably have some, and just look at this beauty! At $4,000, it’s no yard-sale find, but with built-in sensors that detect yard obstacles, it reduces the amount of work you have to do down to simply setting the thing out and turning it on. Swimming devotees will recognize this approach as like that of the pool Simon, and it also falls close to the Roomba technology. And of course, like many products featured here, it’s totally powered by the sun. With one of these and a few free hours to watch it wander, you might actually be HAPPY when your spouse tells you to mow the lawn!