I already saw A Haunting on Discovery Channel of this movie so I kinda new what was gonna happen, but it was actually reall good. However I thought the story of 'Jonah' was kinda sad, rather than scary.
I found this movie very good. I scared me but me and my friend didn't want to show it in the movie theater, thought sometimes we had to. This is the best horror/thriller i've ever seen (so far)
It may be based on a true story, but the people involved with the investigation (the ghost hunters, you could say) were also involved in Amityville Horror which has been proven as a hoax.