OSX: 10.10
HAZEL: 3.3.2 (1215)
In 3.3.2 option "Throw away if a duplicate" works as expected... but only in english language. In finder when you work in spanish (or other language) and press "cmd+d" to make a file duplicate, the word "copy" is replace by word "copia" (in Spanish). Seems that Hazel use "copy" as "fixed" word instead the same variable that OSX use to write "copy" in all languages.
Screencast with an example and comments:
https://dl.dropboxusercontent.com/u/1221912/ScreenFlow.mp4