You may want to read Stereophile’s review of the Rossini Apex. I think there is some guidance there. As you may know, the Rossini & the Vivaldi are similar. In fact when I asked DCS about the differences they were not forthcoming. So I am picking up a Rossini Apex tomorrow.
For you skeptics, the DCS Ring DAC architecture is different. You can read about it on their website.
Hang in there,
Robert