Used with Sonos Connect into my Schiit Yggdrasil DAC (coax/coax). Sonos sounded real good to begin with and was almost as good as my Rotel CDP used as a transport, so the DAC is doing a good job with its internal reclocker dealing with the jittery Sonos. I dig the Sonos ecosystem around the house and would like to keep it in the main system, so I was hoping for at least a little improvement with a reclocker; however, this iFi SPDIF iPurifier is a fanstastic sound upgrade for me. Had considered a couple other costlier alternatives, but not thrilled with upsampling and figured I could use the iFi in my A/V system if it didn’t work out in the main system. As many reviews suggest, the detail, depth, and stage improvements are impressive, and the iFi provides good combinations of input/output, if needed.
I must say that I am primarily a vinyl guy, and use digital at home for music unavailable/unwarranted on vinyl (and Sonos frequently feeds my ADD), but this system addition will have me listening to digital quite a bit more at home. Obviously the iFI SPDIF iPurifier is likely to have different or less impactful results in other systems (e.g., better streamers, better DAC reclockers), but this has delivered an astounding improvement to my setup regardless of its small price.