Thia is a great film which recalls a time when there was generally more patience and respect for intelligent political dramas without predominant 'thriller' or 'action' elements to maintain the viewer's attention.
Love story, satisfyingly detailed political drama, documentary, all elements of the film are satisfied and none dominate. It's beautifully shot also, with some great locations in Europe serving the period detail.
In case you're worried about that fabled 'liberal bias', the film is a model for attempting to represent the real complexity of the 'balanced truth', showing, in both drama and documentary, both idealism and the inevitable disillusionment with it. There is absolutely no sense of that all-too-common 'take home message' here. The documentary elements in particular show more balance than many 'true' documentaries, and do so with great humour and warmth. It gradually becomes very clear Beatty didn't want to heavily edit these to 'bury' contradictory accounts, but instead pay patient tribute to the memories of those surviving members of the original events.
Although, as mentioned in the review above, Reed wrote the undeniably biased 'Ten Days That Shook The World', the drama of this film goes well beyond the idealism of that work, and is admirable in showing at length his colleagues' disillusionment, even when it risks exposing Reed's naivity.
I should finally advise that this film is actually split over two Blu-ray discs (BD-25's) here, so you have to insert the second disc to continue the film.
If you have a computer with a Blu-ray drive, though, it's relatively easy to copy and rename the largest MPEG-2 '.m2ts' files from each disc to hard disk (with programs like 'AnyDVDHD') and join them together.