I recently bought Jaikoz because I wanted to get my mp3 files sorted a little bit.
After doing the autocorrect with the MusicBrainz I had a variety of songs with wrong albums flying around because they were wrongly tagged - even if the tags before were more or less correct.
At the end I gave up - because you need the IDs to get good art and lyrics results and maybe I am just to stupid.
However, if you are not a computer genious and don't want to spend to much time with a program you might end up like me.
A little disappointed....