I'm Still Here

I'm basically beside myself, wanting to see this film. But I want to watch it with someone who is open-minded and into the context of mocumentaries as much as I am. One of my friends was talking about it, and when I said I longed to see it, he said "Yeah, Ri... think it might upset you". ???
So now I'm even more dying to see it. I think Joaquin Phoenix is an acting genius. Have any of you (my dear readers) seen this? If so, what did you think?