When I installed this plug-in, I just took it as any other SEO plug-in. But, it is more than that, for sure. But, all this I got it for a 14 days trial. The options this provides are more confusing than helping. If you add a tag to your post, there is no way you can remove that tag, but, to uninstall the plug-in.
Stay away from such Luxurious-items guys which are just meant for show-off.