A self-emptying station does one thing: after every run it sucks the robot's bin into a bag that lasts for weeks. That removes the daily chore that makes many people tire of a simple robot after a few weeks. Mopping stays manual: you remove, rinse and dry the pad yourself, or leave mopping out altogether.
This class makes most sense when vacuuming is what you want, for example in a house with a lot of carpet or with pets, and you do not want or cannot place a large all-in-one station. The stations are smaller and the robots cheaper. The order below comes from the tests of 5 independent sources. The price is today's lowest including shipping.
Models with a self-emptying station
Score: consensus of the positions in 5 test sources, 100 = top of every source. Every model on this list is recommended by at least one test source. The bottom of a top list is still worth half the points, and a model named by only one source cannot score above 50. Only models sold in the United States count. Method.