Originally Posted by
pauq
I find the Amex map very reliable. The only places where I had issues in the past are those that put a sticker saying "NO AMEX" on the machine and the clerk keep an eye on the card you use so there are no "mistakes"...
So, these would be the merchants that sign up for AMEX to get lower fees from VISA/MC, but don't want to accept it. Nice.