Got a sporty offer for the DO400 and took it (Aoshida on amazon).
Main reasons I was looking at it were: SMSL, I like the devices, works for me. Optics, looks really nice and technical in black. 3 x headphone out incl. the XLR option. ESS9039pro.
It does what I expected it to do. Take audio from a WiiM Ultra via USB. Put out XLR to poweramp, which I can now reduce to low gain at that place.
I really like the simple, yet comprehensive menu. Once set -> just turn off.
The font-o-rama there, previously mentioned, is truly something. They should fix that.
Lots of comparisons with the Topping DX5 II in this thread and mentioning of the DO400 being too pricy. You guys see that you are comparing 9039q2m to 9039pro, different platform and price areas, right? I'm sure there are other DACs with that overall feature set, a 90390q2m and a lower price.
I did not yet own a Topping, but followed the DX1 II release threads. Yeah no I won't be participating in public alpha tests.