I tend to agree that Araxis' programs are expensive. They do offer an attractive educational discount, although not on this program. Also, they are REALLY good applications.
At $20, this is their cheapest program. Tidy Up, for example, is $30. FileBuddy is $40 and has a myriad of features including finding duplicate files. Great program.
Overall I like Araxis FDF, but there's room for improvement:
1. Some file types are not recognized (e.g., text clippings, XMind documents, etc.). File Buddy had no problem with these files. On the other hand, FDF found many images from OMNI Graffle files, and FB did not.
2. The font size seems too small.
3. It does not have many preference, so it does not allow for much customization.
I did like the preview of the files, and managed to get rid of many duplicates I had in one folder and various sub-folders. The process was slow since I would not let FDF automatically choose which files to remove, but just from that folder containing mostly PDF files I got rid of 1.2 GB of duplicates.
I will be using it quite a bit, so I decided to purchase it, but at first it seems a bit expensive.
It also integrates with Araxis Merge.