Shockingly, I have not seen that one. My favorite is a Greek one called Subconscious, which isn't actually all that great, but the whole vibe of it is spectacular. I think when they're done well, they can be stunning, but when they're done badly -- bring the Dramamine. Apocalyptic (documentary filmmakers investigate a doomsday cult), Unfriended (uses Skype and webcams instead of cameras), and Lake Mungo (kid investigates his sister's haunting) get top marks from me.