It's about the Apollo program - mostly interviews with the Astronauts discussing the project and their experiences. Michael Collins and Alan Bean both definitely come off as guys you would want to have a beer or two with. The film is to some degree "talking heads" but they have a very different viewpoint than the typical writer who couldn't relate to how it would feel to sit on top of a 5 million pound rocket, walk on a place other than the earth, and return. Who else could??
It's also a wonderful showing of what can be done when great goals are set and tackled. Fabulous flick.
http://www.imdb.com/title/tt0925248/