Instruct: Classify Amazon reviews into positive or negative sentiment
Query: You won't be able to put it down! Great for kids or adults.

I bought the first four harry potter books about a year ago and did not have the time to read them until last week. I was wondering why the series was such a big hit and I found out. The books put you in a made up world you do not want to stop reading about.When I did pick up the first book to read I could not put it down. There are not too many characters which would confuse children (and adults who try to read real fast like I do), there are interesting twists in the story, and JK Rowlings Harry Potter world is just a nice escape from reality. A very enjoyable read.