I wanted something to delete unwanted contacts. This thing did merge the one double contact in my small list. bravo.
Now, when I tap my Contacts, it shows Empty. But, if I go to my Phone & open Contacts there.... well, there they are. BUT, if I tap my faves or recent and go back to Contacts..... it shows empty.
My suggestion? Stay away!!
RoKuSis about ContactClean - Address Book Cleanup & Repair, v2.0.9