They suck for carpet as well, which you'll find in a home environtment. The diagonal motion chews carpet with short strands up over time. If you have long strands in a carpet, you'll lock up in those pretty fast I suppose, though I never tried it.

I tested the robots in the picture I linked, once in a 'help a human' emergency scenario test: the 'host' dropped on the floor. With her long hair spread around. We E-stopped the robot because it drove close to that hair and we didn't want to risk it getting in the rollers. That would have been very ugly.