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.
The quality is perfect as well as the package. It is really nice and elegant. However, it is huge. Perfect for laptop and papers but not for daily use and not even for travel. So big to take it as a personal handbag on the plane