Quote Originally Posted by harley .guy07 View Post
.... I really like the option to change out the USB card on the dac so if things change or you want to add another capability to it later they might offer another USB card so that can be done. And I like the ability to do upgrades to it as well.
In fact they are (already) offering in a USB upgrade for the Bifrost and the Gungnir DACs.

The only improvement they mention is the ability to handle 176.2 kHz sampling rate. I don't have any music that rate. I did get the original USB with my Bifrost and it works very well, plus I generally use S/PDIF coax, so I won't be upgrading.