Summary: I loved this product for 3 days. It was fast, fast. Sadly, after 3 days it crashed my accounting program and scrambled my iTunes files, deleting 80% of them. This, in a perfectly operating Apple iMac that had functioned without error for two years with the original HDD. Reading other reviews here, my guess is that there is a peculiar 'infant mortality' problem with this product that shows up in only a small percentage of new units. I was just unlucky.