The "How it Works" page doesn't seem to actually explain how it works. I found the Export Guide to be more what I was expecting on the How it Works page.

I was also expecting it to be a bit more seemless than it is. It appears that to sync, I have to manually export my contacts from each source and upload the file to you. Same for syncing. Also, having to use a third party paid tool to sync to Outlook isn't desirable.