It's doing some great stuff right now for my Mac Mini > Bel Canto uLink > Bel Canto DAC3 playback. Just got it Saturday, so about 100 hours on it. Bass is now better rendered, soundstage width and depth better, greater treble extension, lower noise floor, and overall more relaxed and transparent presentation via the ST fiber link and using Nordost Heimdall USB cable. I used to think that the fiber link had some roll off and attenuation, but not anymore. Not so great recordings aren't prettified, though.