Pros: Has everything fiction requires and lots of it
Cons: You can only read it once for the first time.
Plot Summary: Earth is recovering from an attack by an alien species: the buggers. In order to protect humanity, Battle School was founded; a school for training children in the art of war. These brilliant minds will be the future leaders of Earth's fleet. One such child, Ender, is selected for this training. Once the staff of Battle School realizes Ender's potential, they throw everything they have at training him; they are running out of time. The Battle School needs one brilliant commander; a genius among geniuses to lead. But there is a fine line between training a child as quickly as possible and burning him out and the fate of Earth hangs in the balance (doesn't it always?).
This book is my personal favorite work of fiction. Orson Scott Card does a great job of making characters feel like people you know and love. The book is fast paced and events make you question human nature. The trick ending is the best I've ever seen.
The only thing I can really add is that the first time I experienced this story was by hearing it when my mother read it to us. Sounds cheesy neh? But it is definitely a memory I treasure. I highly recommend this book for a family reading. It should be noted then that there are two scenes of "direct" violence. This isn't ships blowing up in space; it is a fist fight. If you don't want your kids handling that kind of dilemma don't read this to them.
The thing my family always says about this book is that we envy those who haven't read it because they get to read it for the first time. Then again, there's always Ender's Shadow...
Lastly, I disagree vehemently that this book has a slow pace. I'm learning that when a person says this it means they don't really care about the events (or thoughts) that are being discussed at the moments they are discussed. This naturally means they aren't really identifying with the character. So take this with a quarter teaspoon of salt. If a family can get through this book reading it aloud, I'm pretty sure you can manage it. :)
Buy the book. If you're worried about your investment, get it from the library. Once you read it you'll have to own it. :)