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.
Definitely worth the money, and much better than I expected. My dressing table is facing the back of the room, with zero natural sunlight. This mirror is a game changer. Only complaint would be — I wish the usb cable is longer.