Definatley a very impressive a/c to say the least, with the Americans still being rather secretive about it, this being demonstrated by the fact they flew an F-15 out with it in very close formation and one behind it so its radar signature couldn't be guaged.
I should also say how great the American aircrews were coming to talk to the crowds and giving away toys to the kids and chatting with them too. A very friendly bunch, welcoming queries about the a/c.