Just started using Beets over the last few weeks and wish I had discovered it sooner. I must say it really is a fantastic tool.
I generally use the -t option when importing but came across an oddity yesterday where, although there was a 100% Musicbrainz match, this was not returned by the autotagger (The Beatles/Abbey Road - direct CD rip from my disc). If I paste the release ID it works fine. Also used Chroma but the results are the same with the closest auto-match being 99.4% - the only difference is ‘country’ but I find it strange that the 100% match is not returned.