Digital Signatures

I'm all about technology. But one thing that irks me are those digital signature pads stores want you to use when you use a credit card. First of all, they are rarely calibrated correctly. You push down in one area and your digital "ink" shows up halfway across the screen. It makes it very hard to write your name. And then the second thing that bothers me is that you cannot even read the signature after you are done. I'm gonna start putting a big "X" on the signature line and see if anyone notices.