I love Eric Carle and his art and this book doesn't disappoint in that respect.
The problem I have with this book is its major design flaw. You see the A page, but to see the next two pages (B and C) you must lift the entire A page up (the fold is at the top of the book). You can imagine that when you refold the page, it doesn't lay flat against the page unless you hold it down at the center binding. If you don't press it down when you turn the page, you bend the page! It's impossible to not bend the page when you are reading to an animated 15 month old... grrr. Also, having pages that are L-shaped (when unfolded they are a large backward L shape) make them VERY easy to tear. And I do mean EASY. My toddler loves to walk around with his books and this one is truly trashed. I think it has 2 or three pages remaining. But since it is his current-reigning favorite book, I have had to buy replacements that only I can hold while I read to him.
His very favorite parts of the book are the front and back pages. The front has the uppercase alphabet and the back has the lowercase alphabet and when he points at it I have to sing the ABC song. Repeatedly. :-)
A minor irritation is Carle's choice of creatures: quetzal, narwhal, xolo (how do you pronounce these words?!?), and unicorn (the only mythical creature). Aagh.