I own the QX5/20 and have used it for a while as a Roon endpoint on my network with an i5 core in another room. Very nice sound much like @rossb describes. Recently added a Wolf Alpha 3SX server to my rack and connected it by USB through the Wolf’s reclocking USB output. I did not know the Ayre QX5/20 could perform at this level... very rich tone now as well as the previously noted air and detail. Much more muscular in presentation.