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.
I've had the single old fashioned and highball glasses over a year. They catch the light beautifully and are always elegant. As long as I take reasonable care when loading them in the dishwasher they are reasonably durable, too. Such pleasure to use for guests and personal use.
My sister loved the glass I got her for her Birthday on May 5th, 2020. However, she said after she washed it two different times in her dish washer the glass had nothing on it. It was just a plane clear wine glass. So perhaps only hand wash this if you want it to last.