Received the USB DAC cable this morning!
Like the Arrow.. it's black, well built, sleek, & unassuming. At a glance, it looks like a plain, 24" USB cable (with a 3.5mm at one end & a slightly longer USB plug at the other). The uninitiated would have no idea there is a DAC. Heck, even I was surprised. Again, very sleek. Both end are gold plated. The cable is solid.. USB 2.0, 28 AWG, shielded. Strain reliefs are solid too. As far as audio settings, max my PC showed the Arrow to be was was 16-bit/48Khz.
Plugged it into my Win7 x64 laptop, it installed flawlessly on it's own.. hooked it up the Arrow & playing music through my recabled HD598's.. it simply sounds fantastic. I used WASAPI output on both Foobar & Winamp and had no problems or errors. More impressions & photos as time permits.. but the cable does indeed exist and it's working great.