I've had a dedicated headphone station with MacBook Air >usb, Oppo 83 >coax, Bifrost 2 >bal, Jot 2 >bal, Aria phones for a year last March. Very good sound!
Then in Mar, consumed by reports of awesome 2 ch SACD via I2s (HDMI) I purchased an HDMI/I2s box ($50) and a Pontus II.
I originally thought the Bifrost had a more punchy sound that was fun with electronica music. The Pontus was notably better with everything else: wider soundstage, better track separation, more detail, more air, etc. An example: HiRes Melody Gardot, Sunset In The Blue...all sounds better thru the Pontus, except the last track with Sting, "Little Something", which is more dance than jazz with base slam which the Bifrost accentuates.
Since then I I had stopped listening to the Bifrost almost entirely and pulled it from the stack to use as a 2ch step up in my home theater system.
Given a good recording the I2s SACD is my 2ch (headphone) "state of the art, wow....
I have only heard a couple of "micro skips" I presumed were cd read errors, not sure of the path. Will have to further investigate given the feedback here. Absolutely no buyer remorse.