I just installed this to replace a SoundBlaster Live Value card, and while I can't say that I've noticed a night-and-day difference yet, it certainly does sound good. (It's driving a pair of Swans Diva M200's, wonderful speakers, but I really need to upgrade the interconnect cable.)
OK, wait...just heard some light cymbal work that the SBLive never revealed to me. Neat.
The VIA drivers are available at viaarena.com
A little more info on the chipset -- and a photo that's just ripe for the taking as someone's avatar -- is available at the "VIA Vinyl Audio"
Bonus: the chaintech card comes with Intervideo WinDVD 4. I had WinDVD 2000, and was looking to upgrade anyway. WinDVD 4 plays smoother, has some bundled audio effects (though the retail version has more), and has the nifty time-stretching functionality that lets you change the playback rate of your movies. All that and a free soundcard in the bargain