Beautifully designed app that is hampered by some serious usability issues

This is a beautifully designed app that is, unfortunately, hampered by some serious usability issues:

1. If you click on “Display Result” during a scan, it stops the scan. Since scans are slow, it would be nice to be able to work on interim results while the scan is running.
2. If you try to go back to the scan screen while viewing results, it resets the scan and you have to start over (and scans are slow if you have a lot of files).
3. You can’t delete a few files at a time as you work your way down the list…once you hit the delete button the scan is reset and you have to start over.
4. Once you go the the results screen, any folders you selected for the scan are cleared when you go back to the scan screen.

The application also froze up on me during my first use while I was selected files to delete, requiring me to force quit the app and relaunch it (which of course reset my scan results). That drops my rating down from 2 1/2 stars to 1.

Brent Wood about Duplicate File Cleaner - Find and Delete Your Duplicates