Sound Quality: "Stereo-Link" vs. Sound Card


Anyone have experience with "Stereo-Link" USB computer peripheral device which connects directly to amp/pre-amp - as an alternative to a soundcard?
Available at www.stereo-link.com for only $129.00!!
Is sound quality of Stereo-Link as good as from top-quality soundcard?
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Did you end up buying one? I am looking to purchase something of this nature soon to use with windows XP on my dual 933 system, I have a Santa Cruz now but it does not sound very good. I have it hooked to my virtual system-

http://cgi.audiogon.com/cgi-bin/syst.pl?0&999381500&view

I am wanting better quality when listening to mp3's etc. I also saw ubid has had some onkyo use-55's for auction. Those looked pretty good too.
I am not sure what you are looking for, but I found that Pro Audio recordings typically had more information on this subject. I ended up buying an edirol product with just takes the audio in through analog RCA, does the A/D conversion and then uses the usb port to send it to my sound editor.
I use a stereo link in my office system along with a Jolida 302 and Linn Tukans. Big difference over the stock sound card. BTW it was designed by the Sigtech people.