18% pricier ≈ US$600
- Water tank (robot) 270 ml vs 200 ml
- Dustbin (robot) 570 ml vs 450 ml
- Noise level 60 dB vs 65 dB
10 robot vacuum and mop combos at a similar price that compete with the Robert II RS 770 — what each does better, what it gives up and how the price compares.