My sister's 4th and 5th grade teacher read them to her class and she became obsessed with them. My parents didn't like how obsessed she was partially because they're Christian partially because it was a rather intense obsession. When she stood in line for a midnight release for HBP they realized she wasn't going to grow out of it. They sent her on a camping trip with some friends around the time of the DH release. While she was gone they painted her room looking across the lake to the castle and bought her all seven books. I snuck into her room and read all seven within 48hrs before she came home to her surprise.