I got one of these a few months ago and it seems well made and is super tiny. However be warned it may not work on your USB device. The plastic surrounding the metal cable contact is square and larger around than many micro USB cables so if your desired micro USB port is even slightly recessed or has protruding structure near it you won't be able to get the plug in there. I also tried it on some drives and it doesn't get a very snug fit and the cable pops out easily.
That said it is awesome if it will work on your device.
The stuff I tried it on that didn't work was my mophie juice pack plus for iPhone 5 and a western dodo tap passport drive.
I wish it worked. It's supremely tiny.