Just got it!
it actually sound surprisingly sharp detailed, accurate and energetic for something so small. Definitely an excellent pair with the X since it's easy to drive. Powerful bass impact that are not over the top, very smooth mid body and treble too. of course don't expect it to drive the HE-6, but it work perfectly awesome with my lcd x and alpha prime. One of the best choice for work, travelling and all in one dac/amp.
LOL, I definitely wouldn't expect the HP to power the H6s...but that said, my HD800s sounded surprisingly good with it! Not super loud (but loud enough) and the sonics were quite impressive too.
Congrats!