Exactly what I needed

iCloud is my primary address book and Google is my primary mail app. This excellent app keeps them in sync with no fuss. As another reviewer wrote, if you use Google Voice, you really have to keep your contacts up to date on Google. This app finally made it easy for me to have all of my contacts accessible in Google Voice. Completely worth the $4 price tag.

Sleepless in Mexico about Contacts Sync for Google Gmail, v6.5.1