WOW, pro...? everything! this is a must for everyone who has ever questioned Apple's Contacts App.Cons:
a small community, this App definitely needs more attention
amazing, and it syncs without the Apple OSX pref.pan magic, so you can add the contact sync accounts (supporting all of them O365, G, GS, etc.) directly on app level - much much much more transparent and standalone. I just tried to upload some pics, but it did not work somehow; https://www.busymac.com/busycontacts/Bernhard has used this product for one week.