Used it to remove duplicated PDF files - it found most. It failed on files that had slightly different names and modification/creation dates (for example, if file NAME was file NAME 1, and it was duplicated a day after it was created.)

SO while there is room for improvement, in 18 seconds it cleared up a 100 Mb of hard drive space and removed duplicate files. I would happily use again.

Worked on my Intel Core Duo MacBook just fine.