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 product works very well. It had a blemish on one side but I just turned it to the back and we got two "left" bars but were able to take out the end side of one of the bars to make it work. Overall its a nice product for the price.