Reviews of Magic Data speak of the added power & flexibility the add-on provides. But it's the symbols as well as templates that are the heart of Magic Data's flexibility and expand-ability. It can be a lot to digest and wrap your head around though, but there is a built in help/documentation search are that helps a lot, and after that there's the superb support.

Read my other review here for more on that
http://www.concrete5.org/marketplace/addons/magic-data-templates1/r...