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.
Everything about the product is great except the that the surface isn't non-slip. This means that your notebook slides towards you, if you have it an any kind of an incline. I have put a rubber mat on it to stop that but wouldn't have expected to need to do that.