To calculate the overall star rating and percentage breakdown by star, we do not use a simple average. Instead, our system considers things like how recent a review is and if the reviewer bought the item on Amazon. It also analyses reviews to verify trustworthiness.
Very happy with this robot. It's easy to start, has a lot of smart and practical functions like zoning the apartment. The amount of dust it finds in a fairly clean place is astonishing! Highly recommend.