These just showed up today.
Even over the first hour of listening Iāve noticed some significant break-in (Iāve heard enough change that I suspect thereās going to be quite a bit of part-to-part variation in sound until thereās enough break-in). So Iām not going to comment too much on sound, other than to say my observations are generally in line with @DagoRed - least favorite of the Koss lineup, and something odd in the ~5k range.
Something very noticeable is with regard to the USB-C DAC cable. Playing from the Qobuz app sounds 'meh. Not horrible, but nothing really great. Switching over to UAPP app is an entirely different story. Depth, detail, tonality, all much better (the ~5k issue is tamed as well, making me wonder about DSP). The sound is closer to what Iām hearing on my desktop setup (Jot2/BF2 and G111/Revolution). The flavor of those setups comes through for sure, so not an apples-to-apples comparison. But with the USB-C DAC cable, running on UAPP, itās respectable - on par with the ddhifi TC35b running from UAPP. From the stock Qobuz app it sounds much worse than the TC35b. It must need the ābit-perfectā magic 
The addition of the in-line controls / microphone make it a nice āside gradeā to the TC35b.