I've managed to tweak my room setup a bit today, starting with adjusting the speaker toe-in, the listening chair position, and temporarily erecting some acoustic treatments. This has significantly improved the acoustics of the room, to the extent that the bass has improved, the imaging is wider, and the overall reproduction is clearer and more detailed. This isn't relevant to head-fi'ers, of course, but I am astonished at the difference.
With this in mind, I had a good listen to the system today. I'm uber-impressed with this little DAC. Superb clarity, excellent resolving power, and the timbre and tone is sounding better now that the upper mid and treble reflections in the room have been somewhat subdued, and likewise the bass suckout has been rectified by appropriate listening chair placement.
Lastly, I'm taking the DAC over to Dr Darko's place for a comparison vs a Schiit Bifrost Uber and the Resonessence Labs Concero HD, and possibly some higher echelon DACs too. This should be fun!! Watch this space for further impressions later in the week.