What's broken or unimplemented?
* Undocumented surprise error when user tries to re-subscribe in a different currency or change currency. Solution is to recreate the whole customer.
* Docs instruct to subscribe new users to free plan which is actually a bad practice for reasons that include first bullet point.
* Lack of docs/guidance for China payment systems and seeing Stripe server and frontend errors in testing environment.
Over the past few years, we've invested in how we support users (last week, we launched free, 24x7 phone and chat support).
I'm love to hear more and see where I can help (and any cases where we may have dropped the ball)—shoot me an email at edwin@stripe.com