Don't listen to the review bombers giving it one-stars: a group of spiteful people on tumblr are organizing to lower its score. Shinigami eyes is a great extension. The best thing about it is that it's open to the community- no individual person decides what's right or wrong. If you disagree with the way someone's been marked, you can correct it yourself. I like to treat it like a "heads up". If I see the red, I can look more closely at the source and decide for myself if I agree. If you're capable of critical thinking, you'll be fine. Its great to know other folks in the community are keeping at eye out.