The plugin is doing what it should and it is doing it well.
I would rate 5 stars but the plugin updated the wp-header with a log of css code.
Even if the plugin isn't used on the side. So the user need to load all that stuff again and again. If this code would be in an external css file, it would be cached. But it is in each and every header of your page.
So the plugin is working good but it would make your page heavier!