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.
I've used this type of product for window washing in the past and it usually works great. This one developed a hole in the side in the first couple hours I used it. It is very poor quality. I would not recommend it.