Spain
Mixed results on Menorca this week from this US-based visitor -- just now saw the Spain note in the wiki (thanks for that!).
Hotel San Miguel courteously asked, "You want to be charged in euros, right?" My first experience with their stellar service.
One restaurant server made the DCC choice for me -- and even signed the terminal! I complained and she said she couldn't reverse the transaction, but she ran it again without DCC and refunded me in cash for the first transaction (€14.20). So I still have a net charge that's the higher, DCC amount, but I've essentially MS-ed it, so assuming it codes correctly on the Sapphire Reserve as a restaurant I've paid 62 cents for an extra 47 UR points -- sort of an even deal.
At tonight's dinner I didn't catch the terminal in time and the slip printed in USD. I asked it to be reversed, but the server said every time she tries to choose euros at the DCC prompt the terminal cancels the transaction (Caixa Bank terminal). We'll dispute it, but has anyone heard that explanation?
I'd say about half of merchants have been offering me a choice and respecting it.
Seth