This plugin facilitates users to create Survey(s)/Questionaire(s) easily using drag-and-drop method. The clean simple design are crutial because there was no reason to increase their problem. There were instruction in (almost) every page, so the user can pick-up very fast.
In lite version, only plain text, Dropdown, and Textbox are present. In Pro version, there are extras features such as Import/Export survey questions, Radio-button Selection, Checkbox selection, and New page. New features and updates will be added in the future, IF there are a lot of users and consumer of this plugin.
http://ottopress.com/2011/why-you-should-use-gpl-for-commercial-themes/