We've just finished our first (remote) run through our network test harness, and it worked great!
https://www.youtube.com/watch?v=RfvdTYYG0es
This video shows a game owner in a game lobby with another player, the game owner starts the game which loads the same level. At this point the two players interact with networked objects..
Next up is rolling this harness into the game, we are creating a brand new level just to allow for better testing of the network - it will be an arena style map, single area designed to be fast and unforgiving..