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.
If you're sitting on the fence on whether to pay the premium for an ASUS zenscreen or save a few bucks and settle for one of those cheaper OEM alternatives, I'd highly recommend you to just get the ASUS. I too, went for the cheaper ones, and ended up hating the quality and returning them. This model from ASUS works as advertised - build quality is fantastic, screen quality and color are also much better compared to the cheaper OEM models.