Hi all, I just bought a Bifrost MB and a Modi3 to upgrade my HiFi system. (Bifrost MB Serial number start with a B) I have to say that at first, the improvement over my Cambridge Audio 640C v2 (modded) was not obvious. But now the Bifrost has been on for 3 days, and the performance improvement is now clear: - Bass is much more articulate, less bloomy (which also means less meaty acoustic guitars xD). It really becomes enjoyable to follow bass lines and cellos without the relatively overwhelming un-controlled bass I experience with 640C v2 (also true, to less extend on the Modi3) - Mids are less shouty - Highs have more texture and extension (more subtle this one) - Stereo image and localisation is a tiny bit better. Modi3 does not even compare, but that was expected. - Modi3 is much less transparent, and seem to lack a lot of high frequency details and snap compared to the Bifrost/640C. - I was not able to use Schiit's power supply, and used some other. I got surprising differences by using various ones. Note: I experience some important hum on the Bifrost when pluging the SPDIF from the 640C. It might be a ground loop, to be investigated. At the moment Optical and Usb inputs on bifrost give same performance to my ears (usb is noisier if I push the volume, but not a concern.. I might need to play around with the windows audio configuration). I'll post a separate detailed review once all set.