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.
This mat is fine. Nothing special. Soft enough, but quite small...about the size of a door mat. I've only had it a few days. I don't know whether it would help my back pain or not. I suspect not that much. Better than standing on bare tile, but not extraordinary.