Now that the cat is out of the bag with Bifrost 2, I wanted to create a thread where we can specifically discuss and provide impressions of the Unison USB input and the various devices hooked up to it. There is a lot of good info and comparisons in the Club Room Thread especially from @rlow, @earnmyturns & @rtaylor76 to name a few. If I neglected to mention anyone else, I apologize. A little background: I owned Bifrost multibit (OG), Gungnir A1 (multibit) and Yggdrasil A1 and A2. I rarely used USB until Bifrost and got and installed Gen 5 USB cards in Bifrost and Gungnir. Through SBAF, I had the opportunity to beta test Unison and self-installed into Yggdrasil A1 and then the firmware was upgraded when I sent the DAC for the A2 upgrade. I previously used and favored disc spinners (because the majority of my music is on CD) trying a Denon DCD-2560 and then getting an Emotiva ERC-3 (both not true high end spinners). I tried SPDIF and AES inputs into the applicable DACs. I also previously tried and was not satisfied (long term) with non-spinner digital transports in my main system. See https://www.superbestaudiofriends.org/index.php?threads/super-cheap-digital-transport-comparo.3056/ These include RPi + Pi2Media 502DAC and the above. I ended up using Bifrost with Gen 5 USB in a secondary system and liked it for that. Needless to say, I was skeptical of Unison beating my mid-fi ERC-3 AES into Yggradsil A1. I'm copying my impressions from the Club Room thread here: In the interim, my system is stabilized at (digital) Roon ethernet --> Allo USBridge --> Yggdrasil A2 Unison --> Af --> Verite I am reasonably confident that my system is now revealing enough to say that the Allo USBridge into Unison combo is a high-end source. I think you could easily insert any purpose-dedicated transport that outputs USB, not just Allo's version. Unison is that good. Granted, I haven't heard true high-end spinners in my system (like Marv and k4rstar) to definitively say, but Unison, at least via Yggradsil is the best I've heard in my system. I can easily hear the digital shortcomings of all the dynamically compressed music I own. I would strongly consider waiting until the Unison card release before making major transport purchase decisions. There are many reasonably-priced USB solutions that should work well with Unison. Edit: Standard CAT-5 ethernet cable and Schiit PYST USB cable used Edit 2: Allo USBridge with SOLA SLS-05-030-1T LPS powering and stock switcher powering the Sparky.