To calculate the overall star rating and percentage breakdown by star, we don’t 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.
The bristles on side brushes are very low quality and easily get bent. Then within a couple of weeks, I constantly get main brush malfunction warnings, and the vacuum just stops. I have tried cleaning and reinstalling. Never had this problem with the original brushes. Wish I had kept the original main brush before I installed these.