All of the communication methods mentioned in the 'tips' section have proved invaluable for me personally, and really set Stripe apart from many companies. They're fantastically accessible. Need a quick response? Ask on the IRC chat. Think the API isn't right? Have a discussion. Library missing something? Fork it and maybe submit a pull request.

The one thing that makes me consider switching is the lack of bank transfers in the UK (which isn't a problem unique to Stripe).