Really liked the free onboarding resources provided for research - and look likes some nice integrations to be able to directly mimic some of these flows to your own product/platform - though not a feature I have personally used.
Setting up Marbleflows was as easy as editing one of their templates and adapting it to my use case. The preview feature is a nice touch. Finally, the real killer feature is the step-by-step analytics about what answers in the form have been clicked. Really gives me a lot of insight into my visitors.
