( Minimal and Maximal File Size are expressed in number of bytes, not megabytes )
Does a great job finding the duplicate files, however deleting the duplicates is a manual process. For every file that has a duplicate, you have to manually select which one you want to keep. In my case, I don't care which duplicates are deleted, providing that one is kept - but it doesn't give me that option. I also struck some strange errors where it would refuse to delete a file, for no particular reason.
This program does not let you work on a per folder basis. Let's say there are two folders, A and B. Let's say there are 80% duplicates between them and you have about 1000 files in each. You can't tell the program to delete all duplicates from folder B for example. You have to do each file individually (not feasible for me).