Duplicate detection is not so great – Remove duplicate contacts -- Support backup and merge now! Review

It doesn't detect duplicates that well. At the end you'll just have to delete the contacts with just the same name. It has no option to merge contacts. And it will spam you with lots of pop-ups telling you how much time it's saved you etc. etc.
Review by ForegoneFuture on Remove duplicate contacts -- Support backup and merge now!.