Alice and I saw this a few weeks ago at Cinema Village in New York and I was floored.
I expected an informative and mildly boring doc about a forgotten chapter in the history of the American left. Instead, the film was surprising and fascinating, and the whole theater was riveted. It had the unexpected electricity of Capturing the Friedmans, as opposed to the more bland The Weather Underground. There's even a twist that elicited gasps. At the end, the audience burst into applause and chattered about how they must get their friends to see it.