Yes - definately.
My BiFrost came back from Schmitt in Multi-bit form this time last week and has been powered on since then.
Last night my wife and I took in a live jazz performance, giving me the opportunity to compare the BiFrost MB and my other DAC to what we experienced at the jazz club. While I find the MB BiFrost to be a significant improvement over the Uber I also find the upper mids and treble of the BiFrost MB have a steeliness to them that detracts. For example, comparing some high quality jazz recordings to the live performance I find female vocals a bit too cool and the cymbals and hi-hat lacking in natural tone and decay.
My other DAC is the Paradisea 3, which like your Havana is from MHDT Labs. The P3 renders the the top-end with better detail, more realistic tone, and more natural decay (and without "etch", as you described it). When it comes to Soundstage the BiFrost MB is a much better performer than the Uber and here the P3 improves further - adding noticeable depth and a bit in width & height, along with an increased sense of the venue.
My guess is the BiFrost MB's performance is hindered somewhat by the lack of room for the discreet analog stage. About a month ago we had a mini-meet and I had the opportunity to swap a Yggy into my system for a direct comparison. The Yggy was fantastic (with absolutely etch or fatigue).
For those who already own the BiFrost, at $250 the Multi-bit upgrade is in my opinion an excellent value and a no-brainer way to experience the R-2R / Multi-bit goodness.
Now I'm hoping for an opportunity to give a Gumby a run in my system soon.