Very long shipping. The board is very poorly soldered, I cannot recommend. I probably will not use or re-solder some parts before using.
It works like a charm in separating audio noises from analog lines of devices connected via USB. Despite some reports it works pretty well in Linux system also. After selecting proper speed mode (it has a switch for it) one can connect this device to USB hub. All devices connected to the hub are now separated from USB ground, thus avoiding loops and ESR noises. Great!