I do like the small units at the Chili's and just saw one not too long ago at a Red Robin. I slightly worry that someone can intercept the wi-fi signal and decrypt it to find my information, but my worry level on that is pretty low.

My main reason for liking it isn't so much my card leaving me but it seems that as soon as we are done with a meal and want to pay and leave, the server is nowhere to be found! Or hasn't printed the check etc. etc. It allows me to finish, swipe the card, and be on my way with a minimum of delay.