I installed the Unison USB module into my Yggy a little over a week ago and have finally had some time these past few days to do some dedicated listening. I have to say I'm very pleased with the upgrade. I'm hearing similar things to what others have reported - wider/deeper soundstage, even more detail, and a more realistic sound with better impact and decay. Not huge, but most definitely and immediately noticeable, and a very worthwhile upgrade!
My digital front end has really come together with this final upgrade. I now have the Sonore Ultrarendu powered by the Uptone Audio LPS 1.2, the Uptone Audio EtherRegen also powered by the LPS 1.2, Shunyata Sigma USB from Ultrarendu to Yggdrasil DAC, and Shunyata Sigma Ethernet cables from wall to EtherRegen and from EtherRegen to Ultrarendu. All of these various pieces have made a definite and cumulative improvement, and I'm super happy with how things sound!
