David Gifford’s review published on Letterboxd:
I finally got around to checking out this documentary from William Friedkin. The entire thing is pretty interesting and does show what they believe to be a real exorcism. For those interested in the subject it's worth a watch, just don't expect this to turn out much like the Exorcist. There are some serious problems though. There are some serious logical leaps needed, and a convenient not bringing a camera scene.