I've read it. I found it wonderful when I was young, and insufferable after I had gotten a bit better at critical thought.
Among other things, it has one of the stupidest last lines in the history of literature. ("And with his finger he traced in the air a single word, 'Ego.'" ROTFLMAO!!!)
It's a superficially useful book, but in the end one has to conclude that Rand's scenario -- which she has to work really, really hard to set up -- isn't at all believable. If she must showcase her philosophy in a fabricated society, it suggests that her beliefs are less a coherent philosophy, and more a just-so story. (That Rand's objectivism is a just-so story becomes painfully clear if ever you decide to show that her premises are truly objective.)