Great feature! I’m excited to use it, but so far it seems to work as expected.
The next thing for me would be to allow tags for non-library items. Listen Later would be even better if we could tag the artists/albums/songs with the reason (recommendation from a friend, from a review, etc.) why they are on the list. I fear my Listen Later backlog will get bigger and bigger and I won’t remember why some items are on the list.