I loved this book.
It's an instant classic. This is a book that kids of this generation will remember as a favorite when they are adults. They'll reread it as adults and still love it.
The main character, Chirp, is a wonderful, fully realized person that reminded me of the kind of characters I used to love in my favorite books as a child (a couple of which are mentioned in this book!). I also felt such a strong sense of empathy for Joey; I so want to just give them both a big hug. As someone who was around as a child in the time period in which the book is set (ahem), it felt very true to that setting, down to the mention of my perennial favorite soda, Tab. I cannot wait to read more from Ester Ehrlich. Highly recommended.