[slfnflctd]

This is the part of the thread I was looking for.

Obviously the whole question is how a robot cleaner compares to a human.

As you point out, the potential for robots far outperforms humans in multiple categories (although clearly not all by any stretch).

I'd say pricing around that of a lower end new car - or nice used one - seems about right to me. In terms of justifying the price, another thing I haven't seen discussed much is the competitive advantage this can provide. If you're spending less time cleaning, that's more time for other things.