Amazon calculates a product’s star ratings based on a machine learned model instead of a raw data average. The model takes into account factors including the age of a rating, whether the ratings are from verified purchasers, and factors that establish reviewer trustworthiness.
Bought new, used randomly for less than 6 months, i work 80% office at an oil refinery. Zipper fell apart, workrite won't work with me to honor warranty because I didn't buy directly from their website. Read the fine print when purchasing from 3rd party such as amazon. Wish me luck i'm gonna try an see if amazon honors mfg warranty.