I don't even use the X-wing Core for demos. Why? Because there isn't enough going on. If I am demoing for anyone over the age of 8 that has played anything more then Monopoly in thier gaming history I up the ship count by 1 on each side. Armada is significantly better in that regard as the Core Set has enough to be actually enganging.
But I won't try and act like I'm getting a real game out of either Core. I never had to with X-wing, and I'm not going to try with Armada. It isn't what the Core Sets are for, they are not stand alone products.