Hey all,
A couple more answers/clarifications:
1. DAC rollable? Nope. I think we made that clear--we will release new boards when there has been a meaningful change in D/A or USB/input capability. This won't be "12 different D/As in 12 months," it'll be "hey, I don't have to throw my entire DAC away when tech changes."
2. USB vs. SPDIF. I think we've said what we need to say on our site. Our implementation of USB is one of the best, and we've heard all of them (that we can separate from the DAC, that is.) And, in our opinion, they're not up to the level of SPDIF.
Why should you believe us? Unlike other firms, we have no dog in this fight--we don't have a team of engineers spending 50 person-years developing proprietary USB tech, we're not selling an expensive USB solution or trying to license our technology--so we don't really care if you use our USB or not. That's one of the reasons we waited until there was a commercially available solution for USB 2.0--the CMedia CM6631 input receiver. Now, real high-speed async USB doesn't have to be costly, and we can provide great performance on the USB side. For USB, that is.
And, consider this: when those expensive, embedded USB solutions in other super-expensive DACs have fallen by the wayside for USB 3.0 or Thunderbolt or I2S (or whatever's next), you just swap out a card on your Bifrost, and you're ready for whatever future tech there is.
That's how we see the future of computer audio. We're realistic enough to know we don't set the standards, but you bet we'll be able to respond to whatever comes next--and you won't have to throw your DAC away to take advantage of it.