Summary: If you have limited physical storage space, the G-Drive slim will appeal greatly to you. Given the OS X focus, we'd imagine it'll be some time before we see this with a USB 3.0 interface — yet we await that day with baited breath.
Pros: Random 4K performance quite good, Very slim and light
Excerpt: The G-Drive Slim is less than a centimetre thick at 9.9mm, and measures 82mm wide and 129mm long. It's not much bigger than a smartphone and we found we were easily able to fit it in the pocket of our jeans — we don't expect you'll be doing this often but it goes to show that the G-Drive Slim isn't bulky and won't significantly increase the girth of your MacBook Air carry case or laptop sleeve.