It works, but has issues
It does what it advertises, but, has issues:
1. It over reports duplicate file sizes. The reported sizes include both the original and duplicate(s). So, in my case it nearly doubled the reported amount of wasted disk space.
2. The usability for this app is very poor. I much prefer Gemini (also on the app store), but Gemini doesn’t handle hard links, so I bought this instead. Unfortunately, this app still counts hardlinks as duplicates. I was confused by which file would get deleted, because often selecting a file caused the placement of the file to change, forcing me to double check that I did indeed select the correct file.
iPad_Fan about
The Duplicate Finder, v2.0