Originally Posted by
Sintaku
I would prefer the slip compared to having it on the card reader. At least it makes it easier to dispute with the slip. I'd take a photo of it. Then batch dispute them all when I get home. If on a card reader there isn't much proof that you wanted to pay local apart from defacing the paper when DCC is forced.
I really dislike DCC. Luckily I haven't experienced it very often.
As
percysmith said, sometimes the receipts already imply that you willingly accepted DCC. One good thing about the presentation of carbon copy slips in Hong Kong and Macau is that the carbon copy check boxes are foolproof evidence of one's currency choice. MasterCard does give more leeway here compared to Visa.