We love Formidable!

Formidable is the most streamlined yet feature-rich WordPress plugin on the market. I have tried all of the form builders, and Formidable Forms is truly the only one that provides the level of customization I need for complicated forms, while also keeping the workflow simple enough to make simple form building quick. I also love how most niche features are not bundled with the main plugin, and are enabled via add-ons instead. The templates are a great starting point for most of the forms I create.