A scammers delight, nice easy way to skim a card. Perhaps I am paranoid but I never let my cards out of my sight and always tug on the front of ATM to check for skimmers.
I once had a card cloned in a duty free at Gatwick airport the person behind the till said "oh this machine does not work I will have to use another" and as I was in a hurry to catch a plane I did not stop to think what was going on, but before my very eyes and with my help, I was asked to enter my pin into the other terminal my card was cloned in front of me.
It was only when I came to check out at a hotel and my card was declined that I realised anything was wrong, when I got home I discovered that the bank had detected that my card was being used both in Portugal and the UK virtually simultaneously and so had blocked it luckily they had only made a small test purchase in Manchester of mobile phone time before it was stopped and the bank refunded that as well.
Such items as this should be banned and I most certainly would not use one to make payment, I would walk away first.