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.
it does everything it says it does on the box. although, i must admit, i didnt take too much time reading instructions. this got confusing, and i got angry. but once you understand the workings of the system, it coudlnt be simpler. personally i think this bit o kit is now something i cannot and will not live without.