So I bought this DAC

I did try that same little giant board a couple of years back to see what NOS might be like. I wasn't impressed, dull sounding upper end, not much detail everywhere else. But you may like it, horses for courses. Abraxilito's creations using the same chip are in another league, but you'll need to diy, or pay more. If you can diy, want a filter less NOS DAC, and are willing to spend a bit more, Miro's ad1862 is excellent.
 
I have received the dac in question, and with just 24 hours on it I find that it has excellent bass and slam. The resolution appears sufficient (better than my soundcard), and it has no undue brightness or fatigue so far.
 
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Like I had commented on earlier, I bought this same board and I agree that it is pleasant enough. I also bought a AD1865 nos board that looked to be very similar, I found that I liked it better, seemed to do mids/highs better. But there is definitely something about NOS dacs that is compelling.