Neat product. A little more info here:
http://etauro.com/en/productdisplay/dp-usb-charger-duc
This picture is key:
Instead of breaking out everything via one connector like the official dock, this has three. So what you're getting is a no-name USB 3.0 hub, a miniDP->extension, and a 12 power supply. If the miniDP and USB bits are to spec, they will have significant insertion force required and in order to get it to dock nicely, the manufacturing tolerances would need to be pretty tight.
Looks like he's designing for the future with a provision for a network port or HDMI instead of the miniDP. Would probably be best to just have a full size DisplayPort since that's the most versatile for desktop environment. It would be nice to see a DisplayLink chipset in there too to provide an additional monitor output.
BTW the eTauro brand seems to be affiliated with the old tech blog:
http://cn0086.info