I had a vorwerk robot vac for a couple of years. It did a good job and meant i didn't have to do a full vaccum as often.
You could message it remotely to start vaccuming. Sadly that later became the end of it. One day i activated it whilst away from home. Its sensors weren't as good as when it was bought and it i think it persisted in bumping into a bowl containing dog water, spilling water on itself which lead to water damage and its ultimate demise.
Originally it would have bumped the bowl and saw it wasn't moving and went round it, but it seemed to keep pushing it until the water slopped out onto it.
It was good whilst it lasted though