Nice! It's amazing how quickly some things come from China. I was still waiting for shipping confirmation from MHDT Labs when our DAC arrived. I was planning on bringing an optical splitter, so we could feed the same signal to two DACs and do some input switching. I wonder if straight optical out of my Macbook Pro, USB out into an SPDIF converter, or optical out of an iBasso DX80 would be better? I'll just bring them all.
I have not tried my optical splitting as yet. I have compared DX80 and it beats just about everything else I have - perhaps only a dedicated transport costing $500-$1000+ could be better. But we're splitting hairs. DX80 sounds fantastic! I would certainly recommend using it versus the optical from any Mac laptop or desktop I own.
Rumor has it you may be seeking testers of USB cleanup. Definitely interested to experiment with that! One of my DDC boxes died, and the other is quite warm (tonally - perhaps if you remember, we could also try the Gustard, still at the shop, fed by a proper cleanup device). But straight into my DAC via USB, I could discern easily the delta between unclean and clean USB source. Perhaps not under meet conditions, but I'd like to try!