The future purpose is to give the user more information about any kind of barcode. This could be pricing, reviews, background information and more. The application is built so that it relies heavily on plugins to gather more information about the code. You are correct about that "Get opinion" is (currently) only populated from user input. This version of the application was released only a few days ago, and was the first to include the Informed Individual plugin. That is why there aren't really any opinions about anything yet. Please beware that the plugin is in early development and thus is very unstable. In other words: Data saved with it might be lost when the server is being upgraded.