I read this one ages ago but I'm still able to gush shamelessly. Really.
If you don't fall in love with this book I don't understand you. First, the author does a wonderful job to convey the chemistry between the main character and her guy next door who is beyond gorgeous and beyond amazingly annoying. I had a blast reading his dialogues. Secondly, the story at the time - and still is - was a new angle in the young-adult books. We still don't see that many sci-fi novels in YA.
It's a must read for sure. ;)