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.