Some people have been using this script and they've been quiet satisfied with it. They've been able to bring their content to the top of results. Post what you think about it right here!
It's just another tool that is created with the sole purpose of fooling the search engines to think that you have unique content on your blog when you actually have duplicate content. It is a great plugin if you're lazy to rewrite the articles or couldn't afford writers to do that for you.