Well, I thought I was happy with this purchase. I migrated my old computer over and, though it wasn't perfect, I was thinking I maybe just needed to reconfigure a few things to make it right. Then I installed a new bit of software that requires Monterey, the latest OS. This computer, being an early 2015 Macbook Pro, should be able to update to Monterey with no issues.  However, I kept getting a response that firmware couldn't be installed  because "compatible internal storage is required to update." Got on the phone with Apple, and sure enough, this hard drive is not compatible. Catalina is as far as it can go. I upgraded to this specifically because it's newer than my 2012, but come to find out it can't go any further up the chain than the 2012 could. I'm waiting to hear how the company deals with this issue, and will revise this review accordingly, either upwards or downwards.