In the past two days, someone racked up $2100.00 in charges on my Discover Card. The Discover Card fraud unit called to tell me about it and are transferring the undisputed balance to a new account. I didn't even sign up for any anti-fraud services. Given the bad press so many companies get for being mum about this stuff, I am very, very happy with Discover Card.
I've had a Discover card since they first came out in the late '80s. I agree that their fraud detection and response is very good.
On a couple of occasions, my card was turned down at a merchant, and when I called the 800 number later, the operator asked, "Did you make (this, that, and the other) charge?" When I said no, their only answer was "OK, we're sending you a new card." I never even had to dispute the fraudulent charges.
