Q1. No experience w/V-DAC II. Own a V-DAC I paired w/V-Link I. Bought the V-DAC solely to stream Pandora from an Asus netbook to my amp. Didn't A-B any other DACs. Bought it solely on reviews, size and price. It works great for me.
Q2. Don't see why not. I used Kimber USB from netbook to V-DAC. JPS RCAs from V-DAC to amp.
Sounds even better now w/V-Link I in the loop (V-DAC to V-Link via StereoVox digital cable); JPS RCAs to pre-amp from V-Link.
Curious to see what other feedback you get.