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.
This little gadget is a must have. Truly an amazing product. I use to use a huge expensive coffee machine. But not anymore. The coffee is just as good as what the machine use to produce. Do yourself a favour, buy a metal filter though. I don't enjoy the paper filter flavour.
Update: not a single issue with this unit since I purchased it. After months of use it's still going strong. A great little purchase. All the lettering has rubbed off, you don't need it though