I have to admit, I'm holding off on reading it due to the disclaimer:
This book is literally meant to cause you to experience a haunting. Don't say you weren't warned later. Don't complain to Amazon to have the positive reviews removed either, just because it's too scary for you. Things will happen to you, some of them far more intense than you expect, and it's your own choice. Then again, life isn't meant to be held at arms length, but rather lived to the fullest. This is a great place to start expanding horizons.
I've been a Paramedic and I currently work as an RN in an urban Emergency Department - I have a lot of ghosts already and a good dose of reality to drive my imagination. I find written horror affects me much more than scary movies due to allowing for more a more active imagination.
Any thoughts without spoilers?