This version is different than what was on the Discovery Channel. There's more footage, and the missions are often narrated in more detail. This is a must have for every space history buff. There's so much footage I've never seen before. And that doesn't include the hours of NASA films from the era.There are only two issues I have that keep this from being a five-star review. I'd really give it a 4.5.1) There's the "Boom de ya da" ad for the Discovery Channel that goes on at the start of every disc you cannot skip.2) The music, while good, gets repetitive and bombastic after a while.