It is a very simple object. Just plug it in and move the joints to create pretty much any angle you want. This is very useful for a wireless usb stick I have which only picks up from the front of my pc and stuck straight out.
However no matter what angle there is a centimetre gap between the usb device and the computer it is plugged into. I had hoped to use it on a laptop for a wireless audio stick but it takes up a lot of space due to this design and isn't that sturdy a fitting. Amazon also sells a USB right angled stick which I have found does angle a usb device right up against the computer.
4 stars for sticking out and being wobbly.