Definitely a game of minor incremental sonic improvement for the investment being made.I have not listened to the Gumby, but I can speak to nice neat stacks. That’s a tough one, because those that have moved on from the Bifrost 2 have picked up Gumby’s or Yiggy’s (yeah, I’m not going to try and spell those names). To me it seems like a decision between a neat and tidy stack and $400 vs a slight bump up in sound quality and either a lot of desk real estate or a stack that isn’t a stack.
And often system dependent / limited depending on how you want look at it. By that I mean it may be hard to discern the full impact of a particular piece of gear if the rest of the system isn't capable of allowing it to deliver everything it has to offer. I suppose you could equate this to how each component scales with the rest of the system it's being placed with.
For a desktop setup the Bifrost 2 (or 2/64) is hard to beat in cost, size, and its ability to scale with a variety of amplifier pairings.
While it may not be the pinnacle of Schiit Audio Mountain, it never fails to put a smile on my face and keep my toes tapping to the beat as I go about my day.