Also just got these in from Massdrop. I am using software EQ with these and they really handle an EQ well. "Out of the box" I found them muffled and a little lifeless but after EQ'ing them I am super satisfied. For now I am using a Creative E5 as the DAC, nothing fancy but it has an easy to use EQ for lazy people like myself and it was easy to throw it in my chain. (I am using these as gaming headphones as well. They work very well with a surround DSP.) If anyone else has these, try an EQ first before you replace the E/90. When I was researching these it seemed most agreed the E/90 was the weak link but for myself, EQ'ing them gets me 95% of the way there and I probably won't need to go the Stax Amp/cable adapter route, which is good since that would cost more than I paid for the headphones. Also really dig the little leather case these come with, it's a great bag for electronics in general.