No credit card required
Browse credit cards from a variety of issuers to see if there's a better card for you.
Not in and of itself but keep the usual risk factors in mind such as revolving utilization. People repeat the "AmEx hates balances" meme but that's a gross oversimplication. If they didn't want anyone using 0% offers they wouldn't make the offers. I received my CLI's while carrying balances on my AmEx cards during the 0% offer period. I just made sure that they never exceeded 30% and, IIRC, they were much lower than that.
It's not just usage of the card that has an impact but everything in your credit profile.
^ This. If they "hated" balances they would only offer charge cards and definitly would not offer 0% 15 month
There shouldn't be any issues carrying a balance and taking advantage of the 0% APR, but I would suggest paying more than the minimum if you can.
I'd bet a million dollars I don't have that Amex cares significantly less about carrying a balance than they do about just paying the minimum.
I agree with the others that the zero percent is there so you can use it. You definitely need to pay more than the minimums however, and the way I do it is take whatever the balance is and divide it by however many months are left in the zero percent period and make that your minimum. I recently ran up a pretty huge balance on my Amex during the zero percent period for renovations since it was the cheapest money available, and even though I was using a high percentage of the total credit line, they awarded me and CLI on another Amex I also have during that same period. I assume they saw I was paying about 5x the minimum and saw my patterns of always paying things off outside a 0% interest period and deemed it safe behavior. So don't worry about a balance as long as you're still paying significantly on it.
I have about $1500 on a $2500 0% BCE, and not worried about them taking action. I'm paying about 4x the minimum.
I'd rather keep the money in savings earning interest. If Amex decides to reduce my CL, then I'm reasonably sure I could just call them, negotiate a deal to pay the balance down/off completely and have them reinstate the CL.