Fantastic device Moondrop Dawn 4.4 mm
I think it's the cleanest sounding device I've tried, and it's not thin, harsh at all, but it sounds very musical, smooth and refined.
On high gain I noticed that it gets a bit more aggressive and slightly harsh, so I'm keeping the low gain.
Maybe it's because I don't really need high gain, it's paired with Sennheiser HD 660 S and on low gain I rarely exceed 1/3 of the total volume for comfortable listening.
Sometimes I would like a little more body and euphony, but I know it would come at the expense of cleansing and resolution. Maybe I'll buy a second device with a more "fun" and emotional sound.
The only thing that worries me is the non-removable cable, I don't abuse it, but it still doesn't give me an impression of exceptional strength.
Anyway, in two words: excellent sound.