Dreame L50 Ultra

It empties into a 3.2 L bag and holds 4.5 L of clean and 4 L of dirty water, so most homes go weeks between refills, and the dock cleans its own base.

The robot is 3.8 inches tall, so it slides under most sofas and cabinets, though very low furniture may be tight.

It clears obstacles up to 60 mm, handling tall thresholds and transitions that stop most robots.

It covers about 2,002 sq ft per run on a 200-minute charge, enough for most homes, and recharges and resumes for larger ones.