This is an old thread but what the heck, saves me from having to start one. I've been a sole computer music source guy for over 2 years now and have had excellent success using a M-Audio Revolution 7 sound card with a digital coax. But I attribute all of this success to a plug-in, the DFX Audio Enhancer that brings the fidelity of the music to that of any good CDP.
BUT I've been tracking these USB Converters for quite some time now,,, not really willing to pay hundred of dollars to replace what i already consider a good source. Well that all changed after reading the god press about the audiophile upgraded
Trends UD 10.1 USB converter. I was able to find a good deal from OBAD Import in Canada (but they have a US distributor in Washington), the Converter & battery box option for under $160 shipped. I just got the package today and I must say I'm highly impressed with this little gadget. And what surprised me even more was my DFX Audio Enhancer still comes thru the USB, I didn't think it would. Differences from what I had,,,, w/o DFX the sound card wasn't worth listening to. The sound was just flat. Not so with the Trends, the sound comes thru very very clean with
a lot of air between the instruments/singers. I found myself wanting to listen to stereo instead of my mainstay Dolby Pro Logic 2x because all this air in the soundstage was actually creating the illusion of background sound. But the first thing that really popped out,, more than the expanded soundstage,, had to be the bass. I've never heard it sound so clear or tight in my system all tho I always thought it was pretty good to begin with. It's
much better now.

(I still find myself using DFX Audio Enhancer tho, it adds that little something extra) I'm using my own rechargeable batteries that happen to be the same 2300mAh Ni -MH but maybe better made. Dunno but I'm told to expect 4 hours playing time per charge and I already have over 6 hours on my batteries so,,,,,
I'm using a Crystal Cable Digit from the coax output of this Converter. I had absolutely no problems with this plug & play USB Converter, my Windows XP picked it up immediately and I haven't detected any need to any downloads that are located at trends website. I had full intention of sending this unitback if the sound didn't surpass what I've had with my m-Audio sound card. I don't be sending this UD 10.1 back.
Highly recommended!

Cheers,
Robin