Wow! I just finished Duma Key today at work on my lunch break. I absolutely loved it.
This was by far King's best effort in recent years. There were many scenes in the book which actually scared me, like Edgar's frenzied painting during the thunderstorm and the lawn jockey moving around the yard without moving his legs. That last one sent chills up and down my spine.
I also loved all the tension in the book. Like how agonizing it was when Edgar went to sleep, thinking all his paintings were either destroyed or crated up in the art gallery, when we damn well knew that he gave Ilse a painting earlier in the story. I could barely stand reading, knowing something bad was going to happen to her.
Overall, I really really loved it. Especially Wireman. He was such a great addition to the story.