Some brief impressions on the M2pro: The UI is responsive and functional and it's great to see that there is the ability to customize the theme as well, which would be amazeballs. Everything seems to be running smoothly so far. There is a slight lag when adjusting the volume either way by holding the buttons down ie. it will jump 1 or 2 notches more after you take your finger off the button. This will hopefully be improved with a firmware update and thankfully the rest of the UI is super fast and snappy.
By far the most impressive thing about this DAP is its sound. I am just blown away by how good it sounds, especially in balanced. It sounds noticeably better than the Sony NW-ZX300 in single-ended and at least as good in balanced if not better, although I haven't done a direct A/B with them yet. So far I'm just loving the sound and actually can't wait to get home just so I can enjoy more music with it.