Don't have one myself but observe their enthusiastic adoption by users of the sandwich bars near work.
There are a few stories of people being double charged in eg clothing stores where card is read while being moved in vicinity of reader. Provided one from customer and assitant is on QV this is low probability and should easily be resolved.
A greater risk I think is if you keep it in same wallet as another swipe card, Oyster in London is obvious one. Would be easy for machinery to charge to payment card instead of Oyster with loss of discount etc. Keep Oystercard seperate from other cards.
Yes, in theory a stolen card can be used without your knowledge. The transaction limit is low (£10?) and I'd hope that bank would quickly spot unusual transactions or a 'splurge' ans stop the card.
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