I have some initial impression of the A20h, I'm sure you're all dying to hear my n00b take on it.
For the most part I really like it. The sound is great (technical term), no audible hiss or buzz. It drives the XS's quite well, they are very punchy and there is great bass extension. The stage is very wide and airy, imaging and separation are also very good. Though I'm sure much of this is more of a property of the headphones and not the amp which you will lecture me on. I have not heard any pops or noise from changing volume or any other settings. For every db of volume change it makes a click which is kind of neat.
I do have a couple complaints. I'm not sure if this is just me unit but the volume knob has a fair bit of wiggle in between detents. The volume does not adjust with each detent but every 2-3 detents, which I'm not a fan of. The remote is quite cheap feeling, just a re-purposed android box remote and not a great one either. The whopping 7 day warranty stipulated in the manual doesn't inspire much confidence .
While I have you, definitely a scam, right?