Myself and a couple of friends are using the Douk U4 DAC which is stupidly cheap but excellent within its limitations.
We are having one issue using it via the UPNP/DLNA option in Ropieee where the volume is set very low and there doesn’t seem to be a way to adjust it. Apparently some other distributions allow access to alsamixer which allows it to be increased again but that’s not possible with Ropieee for understood reasons. The Force Volume option didn’t seem to sort it.