... The sound quality is hard to say, because in the end it's a player, even if very good as already explained.
For Tags in external SSD mode, after 2 intense and difficult days, I realize that he is very... very... very sensitive to the smallest details of these. > Clearly the tags must be perfect.
I find using music files to launch music with the app very smooth.
The real flaw is as I mentioned > its very poor attempt to recognize artist images (Artist tab) that it tries to embed or it can't find, or so the artist image(s) is not the correct one.
Of course when different Artists in the musical world have the same name, it doesn't help, hence these risky choices.
Too bad there is not a manual option to do it yourself, because there, we will be 100% sure of the result.