I wanted to like this robot but it just didn’t work out.  First, the robot is too big and doesn’t fit under some of the furniture the smaller shark does.  Then, the navigation just isn’t very good.  It doesn’t map very well and won’t go to specific rooms.  Very frustrating.  Had to send it back.  I’m sticking with the vac/mop robot combo.  It’s a pain to empty but works great.