Originally Posted by
Majuki
I can't comment on Ireland from firsthand experience, but many have complained about even places like Burger King doing DCC. I doubt Burger King would even use signature verification on a small purchase. (I found that McDonald's in Australia does though. With their changeover to PIN, it always creates a mad scramble to find a pen for me to sign the receipt.)
If we end up going to Xiamen, I'll keep a lookout for the various credit card terminals and follow some of the best practices here. I can let my spouse do most of the talking. 我說中文不好。

Never been to Xiamen myself. My wife says it is a good city.
When making small purchases, I suggest just use Amex or cash to avoid the hassle. The loss in points and miles are really small.
When making large purchases, like in a hotel or something, just request repeatedly about turning-off DCC, and prepare to do a chargeback if it doesn't work out~ Only these large transactions are worth the extra work.