Believe the negative reviews – Fast Sync for Gmail Contacts Review

This does not work. Oh sure, it will sync your contacts on the iPhone, but it will only transfer name and number. Any other information will not transfer- all addresses will be lost. Do not waste your money. And incidentally, Apple, why are you not allowing us to have gmail contact on our iPhone 5? The iPhone 4 had a setting to use contacts from various sources. Not cool.
Review by ErinDeeLee on Fast Sync for Gmail Contacts.