Operation tango - 'Operation Tango' Is A Great Co

I think the real joy of this game will be playing with someone you know as you guys try to work out the best way to complete a mission without swearing at each other! What benefits does someone who purchases the full game have over someone who is just playing the Operation:Tango through Friend Pass? This gives it a little bit of replayability, but unfortunately, it does mean that after a single playthrough the missions lose some of the surprise aspects.