I did quite a bit a research to find an extension that would suit my needs: allow registered users to create and edit surveys, for survey results to be optionally public, for surveys to allow various types of questions and skip logic. Community Surveys is the only extension I found that meets all of these qualifications. It was easy to install and use. The support is the most impressive feature of CoreJoomla extensions. I usually get a response to email in a matter of minutes, and my problem is always solved within hours. I wanted a custom feature and was willing to pay for it. The tech incredibly supplied me with a free snippet of PHP code that installed the feature. The software and support is excellent.