I wonder whether there should be a "Like" and a "Don't like group"...

What I instantly liked was how fast FB2k was to find all my > 2000 songs; before FB2k I frequently had to reboot the phone just to force a rescan of the music files after having added a few songs via MTP...
I also like the abilty to skip/pause a song while the phone is locked...
It can play Opus on older Android, also!