this video:
http://www.youtube.com/watch?v=YaK8XnZuZ4k ?
These reactions are pretty amazing, but they sum up quite nicely why I didn't buy it after playing the demo (especially the first guy.) I only got to the bit with the monster in the flooded area and just couldn't cope with the stress the game was piling on.
Those guys really know how to make players shit their pants. It's especially scary since you have to fumble with physics stuff using the hand, which is a pretty awesome interface for this type of game, as it is not frustrating to use but does slow you down a bit and the player is certainly not helped by being shit scared.