Does anyone know anything about this usb-dac? Is it worth it's price?

Well, this is my current listening setup: notebook HP NX7400/desktop HP DX7400 as transport for mostly flac audio, foobar2k, onboard audio and very cheap philips shp2000 headphones. I listen to rock/jazz/classical mostly @work and sometimes @home. I didn't notice any noise or hiss or hum playing...