I read this book about 2 years ago and was blown away (I stayed up almost all night for nearly a week because I couldn't put this 1200 page tome down!), but I had difficulty processing her from a biblical worldview. There was something in it that was so appealing ... and so dark and distressing at the same time.
Amazingly enough, almost nobody out there (that I could find on the internet) addresses Ayn Rand from a biblical standpoint (which I'd say includes an examination of why she's so powerful and appealing, as well as showing where her story/philosophy ultimately breaks down). Piper's the only one who I think does it well -- glad to see that he's revisiting it!
From the conclusion of Piper's post:
This anniversary is not a time to celebrate her philosophy. That would be like celebrating a blind person’s exquisite ability to identify things by touch and then use the truth he finds to curse the idea of light. Instead, let the day be a reminder that there are pointers to Christ in every philosophy. And let us pray that we not be like the one-year-old who, when daddy points at the flower, looks at his daddy’s finger instead.