Documentation link for version 8.0, click here.
Survey Funnel is a popular WordPress Survey Plugin. You can use it for Surveys, Questionnaires, and Feedback. There is no limit to how creative you can get with this plugin.
If you are looking for building a massive list in the shortest time possible, Survey Funnel is the way to go. Available with a drag and drop interface. Take an inside look into the features and how the actual plugin works in the video.