They are wonderful at cleaning up and the cats enjoy watching them much more than a regular vac. Plus, owners like them so much that they have done all sorts of wild things with them.
Here's one dressed up for the family kitten:

Does your Roomba do the rhumba?
Oh dear - so many wealthy wimmin - I wish I could afford one to bring me drinks and stuff from the refrigerator when it wasn´t vacuuming house. I also need a robot to make my bed and cook my meals...
I know, it is called a wife..