Okay

This app accomplishes its goal - eventually. 1) Can not back out of an operation or to go to previous screens once an operation is complete. 2) Manage your contacts indicates you can edit them or at least delete a contact. No. Manage allows you to view or call. The "Paid" version is what you would expect from a beta freebie. No polish. The app does not build confidence that it is going to take care of one of your most important data sets. That said, it will eventually merge, clean and kinda backup your contacts.

Czuque about Contacts Sync, Transfer & Move