I just purchased Harmony, based on reviews, usb implementation in this dac and R2R dacs in general, I2S input is necessary for best performance. To this end I'll implement either Musician Phoenix or Denafrips Gaia DDC with high quality HDMI cable in order to maximize performance.
I'll be comparing to my Musetec 005, new Musetec 006 coming in same time as Harmony. I'm interested in how these Sabre chip dacs compare to R2R. Some claim Sabre chip dacs not 'natural' sound, I've had many Sabre chip dacs, lack of natural timbre, tonality is not a universal trait of these dacs in my experience.
With the DDC I'll also have chance to compare I2S vs. USB inputs on the Musetec dacs, Sabre dacs reportedly not as sensitive to clocking as R2R.
My long held assumption is R2R dacs in general not as resolving, transparent as Sabre chip.

