Amazon calculates a product’s star ratings based on a machine learned model instead of a raw data average. The model takes into account factors including the age of a rating, whether the ratings are from verified purchasers, and factors that establish reviewer trustworthiness.
These high capacity Micro SD cards are absolutely fantastic for adding extra storage to the newer MacBooks, especially considering that the newer ones are almost completely un-upgradeable. With one of these in the SD slot, however, you get an easy extra 400 GB to use, and all for around the same price or less than a SSD drive would cost you. Works great for me, I've had 0 issues with it. This is a genuine SanDisk product.