I have had this for over 2 weeks playing music. I did opt for the preamp. Some setup things: Be sure it is not selected by your os as the default sound device, you will lose asio. I did upgrade firmware to 3012? the 2nd newest. I have upsampled to 1,536 pcm. My pc is limited to to DSD256 with HQplayer's more advanced filters. I am comparing it to my Sonnet Morpheus, both using USB and ASIO. And I am having problems. Problems trying to tell the 2 apart that is. There are hints of differences, perhaps a bit more realism with the Holo. Casual listening leaves me befuddled. I use an XLR switch for speakers and a rca switch for headphones so I can switch any time as I have them grouped in roon. There is no oversampling built in on the Spring 3. It's nos or bust or hqplayer or your software. I can't hear much over 8k so I have no idea what I might be missing. There are times I think the Morpheus may be warmer, maybe. Roon and HQplayer is borked. Everytime I see a new post in the roon forum I am totally unsurprised when jussi or roon support asks for logs , setup, etc, quite a bit of work on the user's part to get to the same conclusion that was revealed in an earlier thread. It is borked and they blame each other. One of them did an update that borked the connection and no one wants to fess up. I have a possible alternative with jriver feeding hqplayer, we'll see. Gotta spend more time, maybe next weekend and find that chain that reveals the differences, if any, the best. I have been using the Black Amp as it always portrayed the best inner detail vs EC Zana Deux and SW51+ but synergy is what it is. This will take a while. I have nothing negative to say about the Holo. Ethernet i2s on the Morpheus vs hdmi on the Holo. Morpheus has a volume knob, Holo push buttons, both have remotes. The Holo's display is nicer and more informative. Hmmm, it's about the music though and the jury is still out.