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 analyzes reviews to verify trustworthiness.
I've purchased Salonpas products before locally and really liked them. These were not at all like what I've purchased in store, they're painful to remove and they all sort of stick together in the package.