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 got this for WFH set up and it's so much more affordable than other brands, works perfect for me. Only downside is that its height is not adjustable but no qualms about it, i just place some books under it! Delivery with prime was super quick, got me all set up within 2 days :)