Stay away from it!
When this application was released it was one of the best for contact management. But since it became Full Contact, things started to be a nightmare. It damages my contacts adress book. Upgrading to Full Contact is a full fonctionalities regression. I spent so much time with the support trying to resolve my issues and I got were excuses.
Unfortunately most of what they are proposing does not work properly. You will end up with duplicates, missing information, contacts that disappear….
If you want to keep your adress book in a good health, stay away from this application!
BitchyMe about Cobook