The first problem is that the older Hamilton readers accept the card upside down from gas pumps. I myself am used to tucking it in my wallet where I pull it out, swipe it and stick it back in my wallet the same way, and you can't do that with the Hamilton.Red Baron said:I think this because, even now, despite clear instructions on my ACW, I still hear my ACW telling customers repeatedly "Your credit card could not be read." After about 4 tries I walk over and tell the customer his credit card needs to be inserted right side up.