I highly recommend this book. I'm a teacher. My kiddo is in the pre-emergent literacy stage. At four, she can identify both the graphemes and morphemes in English. This book helps prepare preschoolers in basic vocabulary.
The labels are clear and easy for them to read. I use one to one reading correspondence, with each letter. After correctly pointing to each letter in the word, left to right, she is allowed to "match" the word on the page. When we finish a page, I go back and ask her to find the words we just learned.
She also likes to reposition the stickers. We have not had a problem with this, she has repositioned some stickers up to 3 times. I had a sticker book when I was a kid, so it was fun for me to watch her decorate the My House page.