I haven't really seen it. They did show it on the telly last night, but I was more interested in seeing another documentary, I Know I'm Not Alone by Michael Franti (highly recommended!). I did see a bit of the program they showed before Loose Change where they investigated some of the claims made in that documentary. It seems Loose Change is very selective in showing evidence and they debunked some of the claims made in Loose Change. I didn't see that part (as I already switched to MTV to see I Know I'm Not Alone) but apparently it appears that some claims of the 'official account' of the terrorist attacks on 11 September are false too. So the truth is still out there.
But, to go back to Loose Change. Well, if you like conspiracy theories and are willing to take what you see with a bucket of salt it could be worthwhile to watch it.