I saw it in the cinema, have watched it again since, and would still watch it some more. It's one of the best films I've ever seen.
My girlfriend met the director a while ago, he said that Neil Armstrong was actually interested but he's just so busy they couldn't manage to schedule filming with him in time. They're working on another thing which he may be in. There's also a series they've done now with the Apollo engineers, called Moon Machines.