I just received this directly from Apogee. I’m not an audiophile, but on my Bose 20 noise canceling headphones, the sound quality is now noticeably better. As source material, I’ve listened to AccuRadio, my own iTunes collection, and ClassicsOnlineHD. I’m not sure what the AccuRadio stream is, but iTunes is 256kbs, and ClassicsOnlineHD varies from 500kbs to 2000kbs, with an average of about 1000kbs. All sources sound much, much better. I’ve listened through a 2014 high-end iMac, and a 2012 Macbook Pro–and both sound equally good. I’m so impressed that I intend to purchase a second one, so I can have a dedicated Groove on both my desktop and notebook machines.