It just gives you the ability to edit the CSS on the themes listed under appearance > themes. You cannot upload or use themes found on the internet, and CSS is theme specific, so you cannot use the CSS from one theme on another theme. It will break things.
There are literally thousands of people using the paid CSS upgrade, but there is no list. You can go through the threads in the CSS customization forum and look for links to blogs where people have been asking questions about CSS.
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