Works perfectly. I used to use another nofollow plugin, but it worked only within articles. This extension, however, can add nofollow to all outgoing links, including those in components, modules, etc.
I needed to implement location-based Amazon affiliate ad widgets using GeoIP Country database. I tried to do that with some other modules and plugins, but none of them worked properly for me.
Then I found this extension. Just pasted my existing PHP code and it worked - simple as that.