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.
This is a great product. The only thing I don't like is the connection for the controller is right up near my pillow and I seem to catch it with my arm/elbow when turning over. Maybe that's just me, other than that I highly recommend.