The above anecdote: I was asked why I had an apple usb hub on my PC :)
In terms of performance, so I plugged in this hub on a USB2 port of my PC (yes the product works on a PC). I have connected a USB drive Corsair.
To measure the actual speed of transfer, I used a benchmark software which allowed me to see a real numerical result:
Sequential speed drive: 32.85 mb and writing 24.68 mb
If I connect the same USB key on the PC, I get almost the same values.
There is therefore no loss of speed between the direct connection and connection through the hub. This is perfect.
So in summary, this hub blend beautiful design and great speed.