A pretty good documentary. I had a few problems with it. I had trouble remembering who some of the interviewees were, as they are only captioned once. It's said The Skeptical Inquirer called King Kong vs. Godzilla and The Texas Chainsaw Massacre "snuff movies." Not true: the article says there were urban legends about these movies; that two endings of the former were shot, one with King Kong winning and the other with Godzilla winning, and that The Texas Chainsaw was really based on a true story. It also gives the impression Lake and Ng murdered their victims on camera: they did not. The case of Dmitri is discussed using a single article from The Observer, and the case sounds pretty fishy. Then, the longer of the two trailers included in the special features has Jennifer Bahe saying the filmmakers received a tape in the mail that appeared to be a snuff film, which they turned over to authorities. That sounds pretty fishy too: it's not mentioned in the documentary at all, it's not discussed further anywhere on the DVD. It sounds like something they made up to help sell their movie.
The commentary track is worth listening to, though it's not really a commentary on the movie, it's just further discussion of snuff. The filmmakers and some of the interviewees are gathered panel style. There are some microphone problems at one point.
Viewers of this film might like to check out The Dark Side of Porn: Does Snuff Exist? and J.T. Petty's S&MAN.