Contact Clearout version 1.1.0 is finally out and it brings big reliability improvements and new features.
Duplicate results are now updated live when you edit contacts, you can now sort contacts by modification or creation date, editing has been hugely improved and animations of the source panel should now be more sensible. There also many under hood fixes to the UI.
Contact Duplicates is next on the list. It will soon get a bug fix update for legacy o/s users and then it is moving to the same code base as Contact Clearout. This will bring new features and many improvements, but will be for Yosemite and up only.
Addressbook Clearout will just be getting the bug fixes – we would recommend users to move to Contact Clearout.