I have the British English version and my daughter really loved the book! When it's time for her to sit on the potty she asks for her 'wee wee book', puts her teddy on the spare potty then happily sits on hers. The book allows for lots of discussion, about what the girl is doing, teddy's 'accident' and how it doesn't matter, and introduces the idea of a toilet routine- going, wiping, flushing, washing hands in a very toddler- friendly way. The star chart is great too, although I wish the stickers weren't on the back of it as it makes pinning it up difficult!
I think the book is a great introduction to general potty awareness, gives lots of opportunity to discuss what the girl is doing and link it back to your own daughter and the rhyme and rhythm to the story makes it memorable (and therefore helps emphasise the potty message). A great buy for the price!