It's interesting to me how quickly these things are damaged. I know it's some sort of alloy of titanium and gold (or whatever he says at the end of Iron Man 1 in response to being called Iron Man.) But, sheesh. It's a wonder he doesn't have a shit-load more of these things one encounter with Thor nearly destroyed the one he had and after he fixed the Helicopter engine it was barely operable. And then after the (granted lengthy and brutal) encounter at the end of Avengers his latest Armor is practically destroyed with chunks of it either floating in space several thousand light years away or in another dimension.