<prompt> Human: Hey everyone. I have been offered an American Express card that offers 52 directly deposited into my fidelity money market account. There are no fees, and no minimum spends required. I have two other credit cards atm, one is used mostly for gas, the other used mostly for work expenses or unforseen expenses until I can transfer money from my emergency fund. Both are paid off monthly like clockwork.Those of you who have amex cards, how useful are they? I know in my area many vendors dont accept amex because of higher fees, but it would be wonderful to have the extra cash for investing. How many or few vendors accept it? Has it been an issue when trying to use the card?EDIT: Looks like the 5 is a very old offer, the card is now 2 cash back directly into my fidelity account.  <response>: Ive had one store deny it out of dozens, and it was a new local bar. 