I’ve used it on my collection, album for album. It usually works great with the autodetect-function, but it gets some albums horribly wrong (or not at all), so I am glad I did it piece by piece. Took a long time, but now I just need to do it every once in a while when I add something to the collection.
Most commonly the issue is that it guesses the wrong album release, and puts any extra tracks in a separate compilation album. The songs are still tagged right, but the album is wrong. The worst problem I’ve encountered is when all songs were tagged completely wrong (different names etc.). Happened once or twice for me, but enough to not want to do everything in one go.
I don’t have this issue. I separate the artists with a semicolon, so it is displayed “Artist 1, Artist 2” with each artist being clickable to go into their individual artist page. But I think you could actually tag ‘artist’ as “Artist 1 & Artist 2” and ‘artists’ as “Artist 1; Artist 2”, and it will show up correctly, i.e. displayed as “Artist 1 & Artist 2”, but shown in the artist overview separately as “Artist 1” and “Artist 2”. I think…