I had Gryphon Kalliope 4 days in my system. I'm not sure it was full broken up but it was the best DAC i ever heard with all type of inputs. USB is great but SPDIF are great too. I used it with AC cable Acrolink PC-9500.
Great to know...what else have you heard at this level? Most curious as to how it compares if you can offer any specific observations.