I won't watch it. I think it's all crap. The second I saw the second plane hit I knew the towers were coming down. And I still swear the first (second to fall) was leaning ever so slightly before it fell.
The only 9/11 conspiracy I will entertain is Flight 93 was shot down as the cabin was being stormed by passengers. There were two E4 B's in the air that day for planned exercises. One over DC, one over the Elkins WV region. Eyewitnesses told the Elkins newspaper that one was flanked by two fighters (and that article has disappeared from the internet, but I have read the actual paper from that day.) From there to PA is mere minutes in a fighter. The Pentagon story that assets never were close enough to intercept Flight 93 are bullshit. Given that bullshit, it is plausible it was shot down. And if it was, I don't blame the government for lying about it; first, it reveals specifics of the training exercise that day, and second we all know a large percentage of our dumbass citizens would be outraged.