just another example of why Bitcoin is the best way of conducting on-line business:
I made a purchase from Overstock and mistakenly overpaid using bitcoin. One chat session and one e-mail and the issue was resolved within hours, they quickly found the transaction, and refunded excess payment amount which is again immediately available for spending
when something like this happens with credit card payment it takes weeks to completely resolve and takes several phone calls at least
This is the great experience about the BTC comparing with credit Card.