Very good book. Unfortunately it doesn't get much better after the first book, although the Bean saga comes close. Don't bother with the rest of the Ender saga if you want more of the same, it doesn't resemble the first book in the least.
After the first book, pick up Ender's Shadow which is Ender's Game from the POV of Bean the best character in the book. All of Bean's books are better then the rest of Ender's books.
