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.
Machine arrived early. It took a while to work out just what we were doing with it, but after a few days this machine is making the best coffee I've ever had. One of the best investments I've made - very very happy. Amazon were great to deal with answered questions promptly and as I said the machine arrived earlier than they said it would so overall extremely happy and will definately use again.