I first read this book soon after it came out, when I was in high school. I enjoyed it then, found it touching and poignant, and moved on. I'm really glad that I decided to reread it recently, as an adult. I had forgotten almost everything about the plot, save that it was about a teenaged autistic boy and was "mystery-ish". 
 Now that I'm older, the story of Christopher and his family stood out to me much much more. The book highlights that it is possible to love someone without necessarily understanding them completely, and I think that this is a message that many neurotypical people could stand to learn better. 
 The book is definitely a gripping read, and it's perhaps worth it to simply sit down and read it all at once. During one of the most "action-packed" sequences (view spoiler)[ when Christopher takes the train to London and copes with the London Underground on his own (hide spoiler)] I nearly forgot to get off the train on my way to work. It's rare for a book to hold my focus with such intensity, and really speaks to the quiet intensity of the book. 
 The prose style, use of bold words, use of diagrams, etc. will not be to everyone's taste, but I found them unobtrusive, and to help me better enter Christopher's mind.