Review on G-Technology 500GB G-DRIVE Mobile Pro SSD: Portable Thunderbolt 3 External Storage by Jeff Grindley

High speed, but as others have pointed out, the connection drops constantly, often up to 30 times a day. It will remount automatically, but you just can't count on it being saved properly. Also, its 1GB size limit makes it a poor choice for automatic Time Machine backups. Update: Bought a new premium high speed cable. Surprisingly, it worked for almost a month WITHOUT constant shutdowns. Now I can't leave it plugged in until it is unplugged. TOTALLY CRAZY!