I'm sure this plugin works great. I only installed it to create an xml sitemap so I could submit it to Google Webmaster Tools. I kept getting an error. I read workarounds on how to fix it. I don't know enough about WordPress to comfortably go in and manually change stuff so I just uninstalled this plugin and installed another one that worked immediately.
I'm not rating this on any other SEO features it has. I honestly don't know anything about that.