Thank you for your hard work in giving full details on the D1. Your enthusiasm got to me and I ordered it. It arrived yesterday. I can only say at this time that the sound is quite spectacular...price or no price! Have listened straight out; from MacBook Pro through USB, and connecting an SACD player into analog in.
When it has enough break-in, I'll compare it with the Paradisea 3. I can tell you, though, that the USB of the Paradisea 3 does not have as good a sound as D1. Using the Chinese tube (will replace later), what impresses is the enormous sound-stage in orchestral and highly complex instrumental music (ie. Pink Floyd’s “DSOTM” SACD, Stravinsky’s “Rite of Spring”). Jostling my memory of the DAC1, which I didn't like at all for its too-bright presentation, the D1 is infinitely preferable for my taste in sound. No glare.
As a DAC, I doubt it could swim in the same waters as my Audiomecca Enkianthus, but will compare when I get around my main system in the near future.
So far, it seems like a screaming bargain!