I love this book as a light-hearted comfort read.  There is just a touch of angst in the reason why both of them are faking being slackers but the focus is on their school life, their friends, and the slow build up of their relationship.  I really enjoyed how it all came together, and laughed quite a bit all throughout.  I go back to this one whenever I want something gentle and fun to read.  The character development isn't super huge and is mostly reflected in them coming to terms with the reasons why they were faking it and revealing that they are both geniuses.