Well, unlike the current version of Decloner, it doesn't crash on me so that's a good thing. The GUI is spartan but functional. You're better off if you zoom the window and expand the location column. Alas, they have chosen the gear icon to open preferences. In my book, the gear icon is supposed to be used for contextual menus but at least on those cases there's a down arrow with the gear. But that's trivial. One annoyance is if you click one of the rows in the middle list of dupes you cannot drag-select the dupe files shown in the bottom pane. You must shift-click.
The single focus of this app is to find duplicate files. It found many for me, but alas, no count is shown on the GUI. It*seemed* to run quickly but typically you'll have to walk away while any similar app runs.
The biggest problem I found is it does not clearly display the duplicates! Currently, it is showing me two music files side-by-side that it considers dupes. Unlike the rest of the files, it is only showing one row in the list for each of the two dupes. If I click on that one row, two files appear in the bottom section. Very confusing and makes me wonder if I can trust it. All the other dupe pairs+ have multiple rows. It's showing a single music file in a row later. This concerns me when the removal button is called "Delete Selected Items". For that reason, I did not test the delete function. If nothing else, the Location column has to reflect the different pathing for each of the files.
I've been trying to stick to only apps that use SHA1 (which you can test using the terminal command:
openssl dgst -sha1 fullfilepath-use-drag-and-drop
I'm not sure if this app uses SHA1 or not. It does show a hash (like you'd get from a dgst) in a column. This could be md5 which has been proven to be unreliable (see Security Now podcast). Others use SHA1.
Thanks for the lower price but I'm thinking there are better options elsewhere.