We've just recently updated a client site that was using the original SImplicity theme. The updated was absolutely seamless. The develop has been very thoughtful about this theme making updates very easy. The Bootstrap framework ensures our clients site perform well in search and more importantly is responsive for mobile.
Great Responsive Update to Theme
Don't forget to review the docs here to get started ;-)https://www.concrete5.org/marketplace/themes/simplicity2/documentati...