No problems on that front, with a dozen browser tabs all doing bandwidth-intensive things. Sorry, I'm not going to open it up but here's the answer on the internals from Charles Hansen himself.
Like I'm going to click that!
Anyway, aside from the sound, which on first listen is very, very good, the USB implementation seems to be solid. I'm currently listening through the DAC while simultaneously syncing an iPhone and backing up to an external USB drive -- with no bus noise at all.
Stupid ad that lastfm keeps serving me for some dodgy "colon cleanser". Now I'm not a doctor, but that before picture just doesn't look 100% anatomically correct to me.