I am impressed that Hill has gone it alone with his writing - he's always written under a pen name and always refers to his father as 'Dad', rather than 'my father, Stephen King', which it must have been tempting to do. He's definitely earned his popularity based on his great storytelling, rather than having his career handed to him because of his father. Yay for that.
Heart Shaped Box is an unsettling read and feels incredibly real, which I think is what makes it so creepy. There isn't much gore or blood - instead it's the psychological side of things that will linger with you after you finish the book. While Hill's metaphors got a little repetitive towards the end of the book, the characters were brought to life so well that I couldn't stop reading - I had to know how it all ended.
Oh, also, the dogs were brilliant - some of the most vibrant characters in the book. They were just fab. Look out for them if you decide you check out Heart-Shaped Box, they will make you smile and make you cry.