I definitely heard the swirling artifacts on the high end. It sounded okay, but it wasn't great - kind of like how I can tolerate the low bitrate on most XM music channels even though I really don't like it and it gets fatiguing after awhile.
Musically, I didn't hear any duds. It's a fairly broad mix, but it works.
There's a station in Houston that uses the Barix for their STL, and I don't hear those artifacts. They're a university and part of the original ARPAnet backbone, so they have no shortage of bandwidth - that may make a difference.