I'm really liking SMP so far. I'm a macOS/iOS/iTunes convert to Linux. I listen to music almost entirely through smart playlists. One feature I miss from iTunes is the ability to use a playlist as a criteria in a smart playlist, i.e., IN PLAYLISTX or NOT IN PLAYLIST Y.
This feature gave me the ability to create some pretty amazing playlists without having to over stuff my grouping tags (the main criteria for my lists).