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.
I've received the bands and they arrived very quick. The quality looks reasonable, but time will show. The nylon cover feature was a deciding factor for me to buy these bands turned out to be a limiting factor. The cover won't allow me to stretch the bands all the way up when doing shoulder presses, because of insufficient length for the nylon cover and I wouldn't say that I am too tall for these bands (5ft 11 in). I wish the bands had a bit more length for the cover, so it wouldn't limit the stretching as much.