I did an A/B between the Signature and my PC via USB into the same DAC (onboard ESS Sabre ES9018K2M - Parasound Hint) and I honestly couldn’t tell any difference, but it had zero burn in and I’m only using an ifi PSU for clean. I haven’t done an A/B since it’s been running nonstop around 30 hours. I will say, it sounds very good, but I was pretty happy with how my PC sounded as a transport. My only real impression I’ve been able to gather is that the bass feels possibly a little more coherent/dynamic. It probably depends on the DAC, but the differences for me were not very pronounced. I will have to do another A/B with the PC after full burn in and with an LPS. Unfortunately, I don’t have any other SPDIF transports to compare this to, as I’ve always gone PC–>USB–>DAC in the past.
Initial conclusion is that I’m more than happy with the way it sounds, but I don’t have enough experience, perhaps, to be able to tell how much of an improvement it was to my previous setup.