Amazon calculates a product’s star ratings using a machine learned model instead of a raw data average. The machine learned model takes into account factors including: the age of a review, helpfulness votes by customers and whether the reviews are from verified purchases.
I hadn't used my Aeropress for a decade. When I gave it a go coffee just bypassed the deteriorated plunger seal. This new seal has fixed it perfectly. It was easy to fit. Price/postage was good - cheaper than buying from the Australian Aeropress distributor (costly postage).