I saw this today and it's almost hard to describe it as a movie. There is no character development, no music, no exposition, and very little plot. They use about a dozen different acronyms without explaining one of them. There is virtually no explanation of what the soldiers are trying to accomplish. There are tons of tiny details that are clearly a specific recollection from one of the people that was there. The co-director, Mendoza, was on this operation (he was the guy that dragged away one of the men injured in the IED attack), so I think this is about as authentic of a portrayal as we are ever likely to get. There is more screaming and more close up shots of wounded men in agony than I've ever seen before.
I can't say it was a fun experience, but it's absolutely worth seeing in a theater if you have any interest in this sort of thing. The sound design is fantastic - when the SEAL machine gunner opens up for the first time I felt like he was in the theater with me.
I don't think this movie is going to make any money, so thanks to A24 for making it happen.