Yes, Sonicraft does Bifrost mods but I think to the regular (non-uber) Bifrost...
I still like mine, it is a nice DAC for the cash, but I have had the Auralic in my system and in direct comparison, well... the Bifrost loses out badly. There are 2 main reasons.
- The soundstage of the Vega is wide, deep and steady. It is detached from the speakers to a greater degree than the Bifrost and makes my system sound LARGE, when in fact it is SMALL.
A lot of folks think the soundstage from small speakers need to be small, but the Vega proves otherwise. It may just be folks don't use a source of this quality on smaller less expensive speakers. With the Vega in my system the Omega single drivers perform at a ridiculously high level, and not just "for the price". The mids and highs are far better than average, and it takes some serious high-level drivers to top them that cost many times the price.
- The Vega's sound is absolutely free of any grain or harshness, it is relaxed and easy to listen to. In contrast the Schiit does produce some high frequency garbage typical of PCM audio and to be fair most DACs have this signature regardless of price. It may not be noticeable until you use a DAC that does not do this. It's not something that can be picked out, but it adds a tension to the music that is absent with the Vega.
These are the 2 major differences that I noticed. Together, they add up to a rather massive difference in experience and in my system the sound goes from pretty good to world class going from the Bifrost to the Vega.
The one positive thing about the Bifrost is it is neutral and very detailed. Just not perfect... of course price is 6-7x higher for the Vega.
I would like to try the new Sony HAP1, $2k for a server and DAC is a bit more realistic budget-wise, I have a hard time justifying the Vega... and Mike G also recommended the Yulong as being fairly close to the Vega for about 1/3 of the price.