I've been a loyal American Express (NYSE:AXP) card member for years. If anyone dares to bring up the company, I won't hesitate to loudly extol the best-in-class customer service, my coveted bankroll of Membership Rewards points, and the not-to-be-overlooked 7% year-over-year growth in earnings per share!

But a few weeks ago, I overheard a colleague mentioning a new product making waves in the marketplace. A card with no annual fee, 5% cash back, and even a concierge service included for free. Could this new card from Discover Financial Services (NYSE:DFS) be an AmEx killer? 

I had to find out what this Discover card was all about. In the video below, I discuss Discover's IT card, which, after a few weeks in my wallet has proven to be a real winner with a heck of a lot of potential to win market share from American Express and others. 

Fool contributor Jay Jenkins has no position in any stocks mentioned. The Motley Fool recommends American Express. Try any of our Foolish newsletter services free for 30 days. We Fools may not all hold the same opinions, but we all believe that considering a diverse range of insights makes us better investors. The Motley Fool has a disclosure policy.