As a designer (I claim:), I am totally sold by Verifyapp. Listen their argument in the demo:
“Instead of relying on your own intuition, use data in your design!”
It almost feels painful not knowing about this tool earlier. Of course, this type of tools should be carefully used. In some cases, one person’s unique vision can change a big trend, and caring too much about others’ opinions can distract ahead thinkers.
However, using data would really save time and open up new perspectives to designers. This would lead designers to a great learning experience, and will be also a great tool to rationalize certain decision making processes.