For me personally decisive is whether the part is working under Linux (Ubuntu 11.04). And it does. Out of the Box. The volume control on the speaker controls the volume in the system and the on and off and running smoothly. I run the speakers via a USB hub.
The speaker is running Windows of course. And he does of course. Tested on Windows 7 (64bit).
Absolute buy recommendation! I wish you as much pleasure to the thing, as I have myself!