I am surprised so many don't hear a difference in streamers, particularly comparing those with big price differences. I wonder if "noise" might be veiling the differences. EMI, RFI, ground plane noise and jitter are like grease on an optical lens, it hides the difference in a cheap and a quality set of optics. After significant upgrades to my DAC and Streamer I still noticed a level of glare and lack of resolution that responded favorably to extensive noise control.
I also agree with @mitch2 on the effect of the Sonore SignatureRendu. I was using an UltraRendu to utilize the Ethernet output of my streamer which I preferred to USB. Replacing the UltraRendu with a SignatureRendu was a WOW moment. Of all the upgrades and changes I have made the SignatureRendu takes the cake.