Great post, and I agree with the idea that good design makes a huge difference, but I would have like to see more conclusive data. Seemed a little superficial and also like you believe the $50 icon was the source all the popularity.<p>I would have looked at how many people shared the app after the redesign, how many people invited friends, how many more ratings and reviews you got, how often users performed an "action" everyday, how many days elapsed between log-ins (compared to before), the percentage of "active users" vs user base etc.<p>Keep up the great work!