Shares of Visa (NYSE:V) got a boost today as the company reported earnings. Both Visa and MasterCard (NYSE:MA) have had incredible performances since their initial public offerings, but is there still room to climb at these multiples? In the video below, Motley Fool financial analysts David Hanson and Matt Koppenheffer discuss why sometimes, as Warren Buffett says, it's better to buy great companies at a fair price, than fair companies at a great price.