+1 for Pocketbook

Never had any issues with it whatsoever.

The device works great with Calibre.

There is some other functionality that I did not use.

Should mention Open Sound Control which is also pretty good. Not exactly a competitor, it was supposed to provide a richer, real time interface. Still popular for certain use cases, including beyond music.

Still, if legal, one would “boil” (not sure what the term is for oil soluble?) a kilo with no issue.

In a similar vein, there’s an old saying: “A lie travels around the globe while the truth is putting on its shoes.”