My Teac UD-501 arrived today...
I plugged in the RCA cables, the USB cable, and the power cable, flipped the power switch on, and played DSD 64 and 128 files first time in JRiver for Mac off a 2010 Mac Mini. Plays PCM up to 32/384kHz (tested up to 384kHz by fixing the output from the up sampling in JRiver to 384kHz).
After about ten minutes, the sound seemed to mellow and open a bit and overall it sounds sublime! I'd recommend to anyone for either DSD or PCM playback.
Best,
John