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've used this mixer 6 times so far and it works fine on light duty work like batter and cake mix, but struggles on bread dough the slow speed gets noticeably slower but it struggles on. One disappointment is the quality of the printing on the "TURBO" button which has already begun to wear off. The letters seem to be dissolved by butter or oil on your thumb.