Zen Grid Framework v5 (zgf5) based themes feature a simple and easy to use user interface. There are a lot of features under the hood and at your fingertips, but the zgf5 interface keeps things organised with helpful hints, headings and menus to make sure you stay on the path.
The Buildr template uses the updated version of the interface which merges the layout and design panels together. So almost all design elements can be controlled easily from within a central panel.