Roomba is in a very special category of machines, one able to collect indirectly samples of human tissue, drugs like cocain, etc... as part of their normal work.

Therefore the bigger trouble is not in the data that iRobot could have about your cleaning chores or the shape of your house; the real problem would be anybody with enough motivation ringing your door bell with a fake iRobot uniform and the generous offer to replace/upgrade your old roomba with a newer machine for free. Old fashioned social hacking.