I tried the Unison USB input on my Yggy ( although not with a Unison USB source, as I don't have one...)Yes, I heard that too. However my own experience differed.
For me Unison was not as good as RCA or BNC or AES. Haven't tried toslink.
I was hoping Unison would solve the problem with dacs sensitivity to the source. For me the source of the bits has been at least as important as the dac.
I also preferred AES, RCA and BNC inputs
In my set up, I liked BNC the best.
I will wait to see what the reaction is from other users to the URD's Unison USB output once it is launched, as that is the only reason I would buy the Schiit CD transport instead of far cheaper options like Audiolab CDT 6000 at about £380 in the UK.
I have always been very sceptical about USB for audio ( and so was Mike for many years...) but he seems very confident that Unison USB output from the Urd is very special.
I have a lot of faith in Mike and Jason so will reserve judgement.