This is now my default contact app. I stopped using iCloud contacts and just have my iPhone contacts connected to my Gmail contacts and have full contact for Gmail on the right side of my Gmail on the computer. This hides away with a click. Because people have an online presence, the majority of my 6000 contacts now have a face, links to their Facebook LinkedIn and Twitter profiles and homepages. Email signatures are captured if the person is important enough for you to respond to. The point is I have very little to enter for a new contact and updating is seamless and automated. Support is way better than good. They emailed me that I had a cross-loop and how to identify and fix it, rather than waiting for me to complain and pit in a ticket. Then they followed up. Answered my questions by email within a day. If I see something wrong in a contact, I can check the history of changes to see when something was changed without fear of losing anything. I use Full contact but do not think about it, as it should be.
RefluxNY about Contacts+ | Address Book, v4.13.6