≈ US$440
- Base station Auto-empty dock vs Charging dock
- Dustbin (robot) 420 ml vs 300 ml
- Water tank (robot) 180 ml vs 250 ml
- Charging time 390 min vs 360 min
10 robot vacuum and mop combos at a similar price that compete with the S9 — what each does better, what it gives up and how the price compares.