Been watching that, agree its very good. The day told from the perspective of many people that were there.
Actually had me tearing up when hearing Ron Clifford (I think that was his name), he was in the North Tower, saved a lady and was then getting her away from the tower when the south tower was hit. He managed to help the lady to an ambulance and he was then phoned by his brother in law, where he found out that his sister and her daughter were on the plane that flew into the south tower as he was helping this other lady to safety.
I'm sure there are heaps of stories like this, but that 1 certainly hit me.