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Are 'no interest if paid in in x months' credit cards worth it?
No, because of the balance transfer fees, which could be 4%. Unless of course you get a deal for 12 months of no payment, and you pay it back in 12 months, in which case a 4% annual interest rate is much less than a loan! At that point you are gambling that you will be responsible with the payments, and the card company is taking the opposite bet.