used for a year
I bought the u1 about a year ago, as I moved to a fairly powerful laptop, but needed multi channel dolby digital out, in other words, I wanted dd-live as cheap as possible and in usb.
notable that I use at-surround output plugin with winamp, this gets best results, some of the other multi channel output plugins for winamp didn't work as well(speaker setting problems and such). it should be noted that it(the u1) doesn't have an option/way to spread two channel source to 'surround' feel on it's own, so depending on the application it might not use subwoofer at all but pipe everything to l/r channels(so with atsurround, i get surround sound from music, and can select the subwoofer cutoff hz as well).
by the way, optical toslink cables can be had for a fiver, cheap ones do just as well as expensive, it's just bits - trust your tech instinct and ignore the hype.
one thing that I would have liked, would have been coax spdif out.
the product is not as good as the dd-live capable nforce2's were for example, due to not having as much MEANINGFUL configuration options(like adjusting cutoff hz's etc). however, it still fits my need quite perfectly, which is to connect a dolby digital cabaple amplifier to a laptop pc.
-lassi