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.
I bought this SSD to replace my original hard drive in my MacBook Pro Mid-2012. There was some replacing techniques that you may want to watch on youtube before attempting BUT if you know what you're doing then would recommend to you. Very Fast, not any lower in battery performance. Great upgrade! Am pleased with the 750 SSD versus the 850 or 860 SSD works great!