With installing the Ribbon Designer for SharePoint and Office 365 you get a Visual Studio project and item template to extend and boost your SharePoint solutions. In the past months I spent several hours playing with this tool and found its features can help the everyday life of a SharePoint designer / developer. If you consider to do significant amount of SharePoint ribbon customization, or you are a newcomer on this field of development, and would like to do the job quickly without understanding first all the bells and whistles of the ribbon customization features, you should definitely consider this tool as an option.