TLDR: all functions/decoding work fine, no clicks or other annoying sounds, plenty of volume, volume button is fine for that but weird for other functions.
I got my Tone 2 Pro yesterday and listened for about an hour last night, directly hooked up to my laptop via Khadas ASIO USB driver, using Roon. My first impressions are pretty good.
I fed several different format files to it, mainly to see how it handled various file types, etc. My listening was with HD650s using the 4.4mm output. DSD64, DSD128, DSD256 are all fine, MQA unfolding works fine. Switches sampling rates with no problems.
Noise floor is good, not hearing any hiss or clicks between tracks, etc. The volume knob takes some getting used to though. It's great as a volume knob, but all the double/triple clicking takes a Sherlock Holmes memory to decode.