I have flipped through that little booklet. It is good, it has a lot of nice things in it. My only complaint with it is that it doesn't go far enough, or deeply enough, into the themes and symbolism of the book. The things they do bring out are great, but they could have gone much further than they did.
I think one thing that is very helpful about it, though, is that it's a clear defense of the work against those who deny its Christian themes.
I've just read through the first few pages and I think maybe he's preaching to the choir with me. However, I have a very good friend who shies away from LOTR even though I've tried to tell her it's "ok" and even our church librarian has told her it's a good book. I'm thinking of lending her this book. The "shallowness" of this book may be just enough to hook her. I would love to be able to talk to her about it, but as it is I feel uncomfortable even bringing it up.