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.
Have used this grinder about 20 times now and am mostly happy with it. Beans are not difficult to grind but some trial-and-error was required in setting the grinder size setting because there are no gear markings. Grind is not entirely even and some large pieces slip though the cracks (see picture) but most of it is even so i cant complain. Am able to brew a decent cuppa and it works for my purposes. I have gone thorough a number of grinders that gave me very uneven grinds and therefore inconsistent brews, but this produced pretty decent results.
TL;DR - Not perfect but of good value. Recommended.