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.
Great concept but urgh the suction cups do not stick to our bathroom wall tiles! My 14 months old son still enjoys spinning the moving parts, but I bought this for him so he could observe how the water spins the parts as they come down and was hoping he would learn how to pour water into the cups. A bit disappointing.