"Not the end"
I started this book with the expectation that the 3rd book would be the last. I was wrong. There are only 3 available in audio, but there are 6 books planned in this series. The 4th installment will be released to paperback on June 24th, 2008. I don't know when the audio version is due.
The story is still interesting, but it's getting a little tired. We need some closure. Once that happens, I think there would be a strong interest in other stories set in the same universe.
"Enjoyable"
I'm a long time Card fan and found this book to be thoroughly enjoyable. Card's strength is developing characters that you like and admire and this book is no exception. I listen during my daily commute and found myself looking forward to the drive home each day to see what would happen next.