Instruct: Classify Amazon reviews into positive or negative sentiment
Query: Not for 8 and up, more like 11

As you can tell from all of the glowing reviews, with which I generally agree, this book has a lot going for it. I would add the following.It takes a little while to get up to speed on how time works in this world, even with the helpful exposition provided by two friendly wizards. You really have to understand how alternate universes work in this book in order to follow the plot and appreciate the action. That's fine, and the way it all works is very satisfying. However, I think it would be very challenging and probably frustrating for the 8 or 9 year old that the publisher claims this book is aimed toward. I'm thinking more like 11 years old, and probably after having been introduced to some other sci-fi quest books first.