Zero stars because for many years I have supported the product and recommended it to whomever asked for web-page tailoring. To my surprise, I have found today (a new installation) that I cannot import the exported styles. I cannot create a new one because no edit box appears. With the new release, the product was of no use. This reminds me of Microsoft's attitude breaking old stuff.
I have supported the tool for many years. Stylish, along with Greasemonkey, were my main recommendations for tailoring web pages.
The exact day when I see I can import and edit scripts, I'll come back to the 5 starts. Now I have to find a different set of tools.