Stripe is pretty cool. We've been using it on http://www.IslamicEventFinder.com and was the best library experience to integrate. A few things we noticed, the CVC check is not as impressive, it charges the card even if the CVC is not correct, at least we've seen in a few instances. Other than that it looks solid.

Would prefer some sort of a seal or something on the popup to indicate that their payments are safe, a few clients asked. At least an option to customize displaying that seal would be great and also may be the type of credit cards Stripe accepts.

Is this Checkout thing same as Stripe.js? I didn't get a chance to checkout (lol) this fully yet!