I tried other forms design products such as Typeform and Jotform. Formcrafts is an elegently designed product with powerful features yet simple and easy design interface. Its great that you can insert a formula almost anywhere. However I did have some minor issues, these were quickly resolved with their repsonsive customer support.
Great Support for a Very Flexible Forms Solution - I recently tested Formcraft to create a simple form with very complex logic. The platform was straightforward to use, and (with Formcrafts Support), I was able to build a solution that integrated with their Salesforce rapidly.
I'll be using this tool more in the future!
Formcrafts