I ordered a HagUSB Wednesday and got it in the mail Saturday - thanks for the fast shipping Jim!
This is a major change for my system, going from a cd player (Response Audo tube CDP) to a music server (XP Pro, J River Media Center, APE files, and an ASIO driver) feeding my trusty NAD 752 receiver via the HagUSB, so it's impossible to attribute the changes I hear to one thing. All I know is this is the smoothest most analogue-sounding digital system I have ever personally owned. The HagUSB plugged in and did it's thing without a glitch.
I found a nice use for the headphone output. I feed the little speakers in my LCD monitor with this, and use it to monitor playback since the electronics are in a separate room from the main speakers (in an adjoining home theater room).
I like it!