Almost there...

While the application had no issue finding proper duplicates, 95% of the hits were technically false positives. That’s because the application scans the photostream folder. Which if you have your iDevices on automatic backup over WiFi, means that it will hit 1000 duplicates (Photostreams max pictures) against the originals from the over the air backup. And since the Photostream is constantly in LIFO mode, you will never be able to get a proper clean up.

Hopefully this oversight can be corrected soon.

Skull_One about Duplicate Cleaner For iPhoto, v1.5