Like a regular robot vacuum, the self-emptying ones navigate around your house tackling dust, dirt, hair, and crumbs, then return to charge without your involvement. But because robot vacuums typically aren't more than four inches tall, there's little real estate inside to house a roomy dust bin like upright Dysons do. A half-liter robot vacuum bin requires manual emptying after a few sweeping sessions, if not every single time. Though the fact that they're bagless is nice, you typically end up reaching inside to pull out stuck hairballs — and inhaling the inevitable puff of dust. A self-emptying robot vacuum actually takes that job out of your hands. It automatically empties itself into a larger dust bin in its charging dock, which has the capacity to manage weeks or months of dirt without needing to be cleaned or emptied by hand. You can literally set it up and forget about it. You may need to clean the brush roll from time to time, but otherwise it's a hands-free cleaning experience.