Well, it arrived today an no problems at all. I installed the driver, launched Pure Music, and it came right up. It's hard to compare A/B, and I may have "buyers desires" but it does appear to add an additional layer of clarity and snap to the sound. Listening to "dreams" by Fleetwood Mac, I noticed that the percussion popped forward and was more clearly popping out of the background. On Shpongle's "Molecular Superstructure," the acoustic bass sounded quite clean and smooth, no fuzz at all. From memory it seems a bit clearner, but it's hard to say.
I'll play more this weekend, and see if USB/coax switching via Pure Music works smoothly, and if I can get some A/B going where levels are matched and I can switch quickly.
I did try a hot-disonnect and nothing bad happened, for what that is worth.
Lastly, I am VERY happy I can play my 88.2 source material without downsampling! The Pure Music/HiFace combination does, at least, work smoothly, and even when I mixed sample-rate source material in a playlist, actually handled it graciously.