rely? no

find it a useful assist? yes

the Roomba can:

• get under couches that my other vacuums cannot

• deal with 90% of the average mess (dog hair and miscellaneous crumbs) without my input

• pick up the little bits that you can never manage to sweep into a dust pan

• do this within about 10-20% of the time it would take me to do it myself

things it cannot do:

• vacuum carpets

• get into corners

• deal with large messes

typically, I will sweep crumbs and crap out of corners into the middle of a room. I do this all the way around this level of the house in under two minutes, which includes picking up the large clumps of fluffy dog hair that have accumulated along the walls and tossing them in the garbage and putting the broom back. I can then run the Roomba, and the only thing left to do after is brush/vacuum the carpets & rugs well.

I also like the mopbot thingy because that definitely takes less time than doing it myself