Review on Belkin Upstream Charging Thunderbolt Transfer - F4U097Tt by Bruce Lucas

So I actually returned THREE purchases before writing this review. For some reason, NONE of the three devices (of this product) I bought support USB devices. While the Displayport (which I basically got it for) works fine as none of the USB ports work, this device is effectively useless. i'm just so confused This product has many good reviews. How is it possible that I had three bad lemons in a row?! UPDATE: I tried a completely different Thunderbolt dock and got the same problem. However, somehow this other device was able to recognize and approve/install the computer's Thunderbolt dock, allowing the rest of the ports to work. I am withdrawing my 1 star rating as I assume this has been my problem all along. SO SAYING, I remember the dock only supported 4K at 30Hz for my monitor. That's why I'm holding back the last star.