Works great! The auto-fill feature is spotty, works less than half the time, but that's not really a problem, I can copy and paste which is still faster than typing in a credit card number.

Having my credit card number compromised is a huge hassle, can't use my card until I get a new one, and then have to change all my auto-pay settings... anything that helps reduce how often that happens is a good thing! And if this makes it easier for Cap1 to identify the "bad" merchants who let customer data into the wrong hands, all the better.