the hub perfectly fine on my Asus ultraportable that runs on Windows 8.1.
It was recognized immediately, and had no problem to supply an external 2.5 "drive 1 TB, USB 16GB ....
It is very compact and its square shape is very convenient, the flow conforms to the USB 3.0 standard (no performance loss compared to device connected directly to the USB 3.0 port of the PC).
Recommended!