Refreshingly fast operation.
Durable drive, well made, and (especially) very fast compared to hard disks. Some operations on the SSD ran thousands of times faster (no exaggeration) than with the hard drive. (For example: Running CCleaner on macOS on the hard drive took over 227,000 + 314,000 = 541,000 seconds (that's over 150 HOURS, over 6.25 days) on the factory hard drive on a MacBook mid-2012. The SSD did the same task in 46 + 103 = 149 seconds (almost 2.5 minutes), or over 3600 TIMES faster. Ten minute boot ups became 35 second boot ups. The Mac beachball and swirl pointers used to be common, now they almost never appear. Transfer rates in some cases were indicated to be as high as 122 MB/sec on the mid-2012 MacBook. Also, no mechanical parts, no concerns over moving the Mac around when using it (a concern with mechanical hard disks where simply quickly moving the MacBook can damage the drive's head, platter, and bearings). Also, no heat from the SSD, and the battery endurance is about 30% longer with moderate loads and display brightness. I wish I upgraded to this years ago.
Verified purchase: YesCondition: Pre-owned