This add-on is light, versatile and handy Rated 5 out of 5 stars
Stylish is absolutely my favorite add-on (people who use it, should also check out the "colorful tabs" add-on. I think that both of them when used together turn your browser into a wonderful colorful experience).
I was worried after installing this add-on that it might slow-down my browser but it didn't (it doesn't consume too much memory). Giving the fact that I haven't found any "cons" to list about this add-on (not yet anyways), I would say thumbs-up for the developer.