Easiness and speed. It's too easy to use, you don't need extra guidance to create your tests, and you get your responses quickly. It's the best tool to validate messaging I've ever used.

Agility in delivering results, the ease of setting up a test, and the audience quality (especially for C-level positions), which is difficult to talk to normally.

The ability to identify an audience of people in the open market and get their real feedback is amazing. And the tool is easy to use and fast to get you the feedback you need.