Pros : Simichrome Polish delivers the most brilliant and long lasting shine with a minimal amount of elbow grease. It's incredibly potent and easy to use. Just a pea sized amount on a rag can easily polish a small to mid-sized panel.
Works great to shine copper patina and in my experience can create a beautiful aged bronze effect when used on black patina.
Cons : I have seen simichrome polish take copper patina off especially in raised or over polished spots. For that reason I use this polish a bit more gently on copper patina. Not to worry - if you do accidentally polish a bit too much you can easily re-apply patina.
Other Thoughts : Use sparingly! A little really does go a long way.