There's something silly about the concept of a robot vacuum cleaner, right? No argument there. Still, if it were nothing more than a flash-in-the-pan novelty, the iRobot Roomba would have gone the way of the dodo—but it didn't. Its uniqueness may have catapulted the product into the public consciousness, but now, years after introduction, the Roomba remains a favorite. Why? The gadget truly lives up to its promise. What's more: After years of continual improvement, the Roomba now overcomes what once had been its only real shortcoming. Now, it automatically adjusts to all floor types, making it a viable auto-cleaning solution for almost any home. Available at Amazon; $374.