Up until today, I had been using a V-Link 192 to go from my Mac mini to my uber bifrost because it didn't have a USB input. I bought and installed the gen2 USB card and thought I'd share the differences.
I wasn't really expecting there to be a big change, but I was surprised how different the two sound.
1. Right away I noticed MUCH more separation and layering from the gen2 card.
2. The gen2 card definitely has a lower noise floor.
3. The gen2 card was more resolving of musical information, BUT it's also brighter and I'm not sure if one is causing the other. I'm hoping the new gen2 card mellows out with break-in, otherwise I'm going to seek some copper interconnects instead of my copper/silver ones that I have now. Come to think of it, the whole presentation from the gen2 card sounds like pure silver interconnects or speaker wire. It's very punchy, with bass-drum kicks that seem quicker than what's natural. So in that regard, the V-Link is better because it's more natural sounding.
Usually tone trumps everything for me, but in this case I'm going to act like somebody's girlfriend who sees potential in their new mate and thinks they can change annoying behaviors for the better.
*edit* Using my HD600's, I swapped out my Cardas cable for the stock 650 cable. That toned things down a bit and now it sounds pretty nice.
All of this will change though because my HD800's arrive on Monday!