Credit card issuers have to make a profit. No one objects to that. But when they do it by hiding or disguising what it really costs you to use a card, that's not right. Teaser rates, low in the beginning but rising after six months or so, are a popular way for card issuers to attract new cardholders. Costly cash advances.
Grace is gone.
If the issuer charges interest from the date you make a purchase, these cards are expensive even if you always pay in full each month. Grace is iffy. Most cards having grace periods charge interest on new purchases if you carry a balance. So if you're counting on a grace period, pay your bill in full each month. Grace is brief.