[JoshTriplett]

2015 and people still use Discover cards. Why?

I can think of several good reasons to use American Express, despite it being somewhat less widely accepted. But Discover doesn't seem to have any obvious value over a MasterCard or Visa.

[bluejellybean]

Discover support has been top notch in my experience and after having a number of issues with other credit card providers they've been my goto for a number of years now.

[jazzyk]

Their value is providing competition to Mastercard/Visa. Without Discover, the duopoly would charge even higher transaction costs, etc.

[mikeash]

What about American Express? They're doing pretty well. I don't think I've ever seen anyone use Discover, so I don't know how much competition they really provide.