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I pay attention to credit card readers.
I have gotten to know their makes and some models. I have developed preferences. When I go to a run down establishment and they have a nice reader, I am pleasantly surprised. I know that walmart uses ingenico isc250s, and they do not support tap. I know that dunkin has high quality readers, and sometimes tim hortons does too, but less frequently.
When leaving a place, I might say something like “damn, you don’t see that model of verifone very often”, and my friends will look at me funny.
Semi-related, did you know that most receipt printers have embedded telnet servers in them?