I do a lot of book summaries as a librarian on request of teachers and students. I sometimes get it done by this service and they are pretty good at it. I even asked them once to do a book summary of an audio book, and it went great.
I just have couldn't have enough of it. I read in the library and listen to audiobooks while communiting. At $14.95 for a book a month it isn't enough for me. I get over with a book in around a week. I usually prefer short books.