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.
Unfortunately, the handle shaft support is very poor and it rocks as it is rotated, causing the ceramic burr to grind off-center creating poor grounds of vastly different size. Solution - create a better support for the grinder using a mold-able muffler putty of all things, quicker than returning and getting a refund!!