Ranked in these QuestionsQuestion Ranking
Pro Uses Music Brains and Discogs
Plus the manual editing features seem decent, if needed.
Pro Simple & clear UI and workflow!
The interface is clean, simple and well organized. Not much voodoo involved, every button has a hover description which is enough to figure things out as you go.
Pro Free trial
Without save for more than 20 songs. But that's enough to see how it performs since it'll still show all the tags it finds.