I have 2 of these in a raid cofig and they are fast and reliable. I replaced two 2tb 990 Pros with 2 of these. I was having random freezes and other issues with the other drives. I sent one of the 990's back for repair and got the same one back, with the same issues. That's what led me to buy these. I've had them installed for a month and no issues. I took them out and reinstalled the 990's and the issues returned. Same image on all the drives. I have an nvme 4 laptop so these are only marginally faster than the 990's but that was to be expected. I was afraid it was a motherboard issue but these fixed things for me. WD will get all of my drive business from now on.