I've been aware of this for quite a while (perhaps since its launch?) and that it had a "landmark" reputation.
As such, I'm glad I've now seen it, although I doubt I'll be rewatching it, or recommending it to others. At base, it's an interesting perspective on the industry and these characters in particular, but I suspect most people's reactions will be dominated by the feelings towards the latter. Personally, I was initially drawn to Tigr and somewhat daunted by Mitch, but found my reactions heading in correspondingly opposite directions as the film progressed. The "producer" however remained an unremitting nasty sleazebag throughout, and thus a difficult presence.... noting that he was a porn director "in real life" I did wonder whether this was somewhat realistic, or whether he was playing up this angle for the camera, as most of the rest of the crews came across as collaborative and supportive.
Worth a look, but not really recommended.