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.
These were the original cleaning tablets that came with my Breville Barista Express Espresso Machine BES870BSS. I have continued to use them after every 500 shots of coffee (that's when the cleaning light comes on). They do an excellent job. Others opt for cheaper cleaning tablets, but if you are using 1 tablet every 500 shots, I would rather pay a little more for the original tablets that came with the machine that continue to clean my machine very well. I have made over 5000 shots of coffee, which means I have used at least 10 of these tablets.