Since the terms and conditions of owning a card, certainly in the UK and I believe much of the rest of the world, do not allow you to let the card out of your sight in strangers' hands, I find it very uncomfortable watching the staff taking away my card to get out their cloning kit....

But pay at table, certainly in informal dining, is taking on a new dimension with apps like Qkr! which allow you to scan a QR code embedded in the table and pay that way. Saves having to wait for the bill - you each just pay and go. Far better.