Narwal Freo X Plus

Quite a bit. The dock does not empty dust, wash the mop, or air-dry pads, so you empty the 800 mL onboard bin, rinse the mop pad, and refill the 280 mL water tank yourself.

At 4.2 inches tall, the robot slides under many couches and cabinets with a bit of clearance. Its 14 inch depth and 13.8 inch width make it a fairly standard round-ish footprint.

Yes. It stores maps for up to 4 levels, so you can map different floors and let it recognize each one. You still carry it between floors, since it only docks on one.

The mop lifts up to 8 mm to clear low carpet and rugs. It does not automatically detect carpet, though, so you'll want to set no-go zones for thicker rugs to be safe.

It uses two side brushes to sweep debris from edges and corners toward the main combo brush. The side brushes are not extendable, so very tight corners may need occasional touch-ups.