Wayne Thomas Batson has done an excellent job telling an interesting traditional fantasy story. Yes, it is aimed at middle school age kids (not unlike Harry Potter or such), but I am a 41 year old doctor and I loved it. I downloaded it because my daughter was reading it, and I the book looked interesting. Plus, it never hurts to find out what your kids are reading!
Yes, it has a Christian influence, but it is not heavy-handed (think Chronicles of Narnia). There are a few slow parts in the first half but by the end it was quite gripping. This one is read by the author himself, who really throws himself into it. All the voices are well done overall, a few of the accents are a little goofy (particularly when he slips into a pseudo-English accent while narrating), but certainly better than I could have done. I definitely think that we need more of this type of author in this genre providing well written stories for our kids (and us!).
As an aside, we also have been listening to it in the car on long road trips, which I highly recommend as a good family way to pass the time without watching TV/DVD for hours on end!
Overall, definitely recommend this audiobook.