I like this plugin, it is unique in case you look for forms, questionnaires, surveys, etc.... it is very flexible, with many functions, logical combinations and possibilities, and it is easy to use, even for complete beginners as I´m.

I would like to thank especially the great support service, which is coming with this plugin: you could contact the development team via the support page and get immediate support, even for simple queries or self-made user problems, they support you within hours and deliver proper solutions in an understandable way.
I recommend the plugin including the support!