DI-V3S just received.
I switched connectors inside the DI to have current technolgy going through RCA instead of BNC.
This was not that easy as Audio-gd put some glue on the connectors to prevent them from unplugging during transport, but I managed to switch them.
As far as I can say right now, vs V1:
Far less treble peak than V1, very good point for me, annoying treble peaks are now gone, which makes sound much smoother on the highs with same level of details or even better. No more need to turn volume down sometimes now, what a relief. I finally can listen again to some records I found painful to hear.
A little more focus (a small veil has been lifted).
Slightly better tone accuracy.
Slightly higher frequency extension both sides and a bit more details.
Dark background, not much difference with the V1.
Overall, a decent upgrade and a really good sound. I enjoy it.
I'll report later after more burn-in but I don't think it'll change a lot as I never found huge differences before/after burn-in except for headphones.