Really cool concept, thanks for sharing. :)

Small nitpick, but there's an extra l at the end of "renewal" in the mockup. The capitalization of "Next Subscription renewall" is also a bit off-- maybe consider "Renews on:" or "Next renewal"?

On the pricing side, I definitely agree with runako. Prices are much easier to lower than raise, and so you should experiment early on with the higher end.