Just re-read it a couple of weeks ago - I read it for the first time when I was about 18 and thought that the girl in it was just like me - I have this really overblown entry in my diary where I'm raving about it - exclamation marks and omigods all over the place.
I read it again to see what the girl seemed like to me now I'm 35, and I have come to the conclusion that I must have been a right pretentious PITA back then!
I love the way he writes the different characters - still found it very creepy, and found myself trying to puzzle out possible escape plans that might have worked.