That's a good news in general, but a bad news for me because it does not work and I have no idea where the issue is if it works for both of you. Anyone knows which packages might be related to this? gstreamer is installed on my Pro¹.

I partly replied when you asked in the Leste thread, and I agree with Mosen, notizen.md is very flexible if you know Markdown, but there are simpler alternatives. You won't have desktop widgets as you have with Maemo 5, but some of these apps show extracts of those notes on the cover, so it is kind of the same as long as the app is started.

For Music, QuasarMX is nice indeed, extremely comprehensive features and well thought UI. I also like simpler players with folder support, like Deadbeef Silica, Unplayer, etc., but QuasarMX is by far the most advanced.

In any case, if you hate Android, you don't risk much trying Sailfish. You can just reset the Pro¹ to factory state (Android) if you don't like it or want to sell your device. At worse, you'll finally have had the opportunity to try SFOS. Beware though that the keyboard layout is rough around the edges if you have a qwerty version, and unusable at the moment if you have qwertz.