So far, I had mixed feelings with the Eximus. I don't understand how it could get such rave reviews. It is a very fine DAC, but certainly not worth the $2500-3000 asking price.
Sure, the sweet and intimate presentation is very nice, but it lacks bass impact/extension and dynamics in general. Also, I don't hear that sense of flow the Metrum DACs are known for (the Eximus was described as a Metrum Octave on steroid). I really like the timbre presentation and the tonal richness, but the lit-up tonality is too much for the Hifiman headphones, IMO.
By comparison, I find the NFB-27 almost makes a home-run (tonal richness is where it falls short, but it is very organic nonetheless) and even the Ciunas DAC - which comes at 1/5 of the price - is a better match for my taste (tonal richness is there, this time).
The lack of dynamics is my main concern as it removes lots of the musical traits in my music (rock & derivatives). You could say I'm the opposite of Bourne Perfect: he found the M7 to be lacking "life" and "musicality" compared to the DP1 -> I found the opposite with the NFB-27 (which does not even have the tonal accuracy of the M7).