I watched it a couple days ago. Nick Broomfield does an excellent job as always at showing every side of the story, and being pretty fearless as far as going out of his away to make sure the people who knew the 'Grim Sleeper' had their opinions heard. And that the residents of South Central who felt disregarded by the police and local white media had their views heard as well.
Dude recruits a former strawberry and would-be Grim Sleeper victim to be his liaison and they really go up and down Western Ave talking to the girls on the track about whether or not they knew the murderer or had experiences with him. Very interesting doc.