They have a big vision and nice design/implementation.
But very little innovation, a basic feature like quizz categorization to facilitate organization has been "in progress" for over a year.
They also promise text based quizzes which I don't really see it happening anytime soon. I wont refund for now and but at the same time I feel a bit disappointed. Maybe they just do support (which is solid) and marketing and no further product dev which is a shame. Hopefully something new comes up in the next 2 months