Fan-freaking-tastic. Haven't beat the demo just yet, but what i found most scary about it, was that I was more scared the second time through.
All horror games leading up to this point scare you at first, as you set off the event and then have to handle it. When you go through it a second time, you know where to expect the attack and able to strategize your moves to take out the obsticle.
What scared me the most here was, on my second run through I was waiting for the splicer from the direction he came at me last time. I stood at ready when out of nowhere the thing blindsides me! I actually jumped and find myself flailing for my life and the realization came over me that in this second walkthrough I still wouldn't know where the attack would come from or how the monsters would come at me!
Sounds like the actual game is going to be even more so... I've definately been pushed forward a bit to maybe buying this when it lands.