I just installed TuneUp and Rinse.
I have a problem with albums having 2 and 3 copies of each track. It's freaking ridiculous that iTunes duplicates files.
TuneUp can only find duplicates based on Artists and Title. If you have an artist with a greatest hits album it shows the songs in the greatest hits albums as duplicates. However, they are not duplicates.
Rinse is able to find duplicates based on Artists, Title and album. That way you only delete duplicates within a specific album and not across your library.
I demanded a refund from TuneUp; they are incompetent programing crap. Plus, you have a bunch of pop ups trying to sell you concepts and other crap.