I don't know how some of you get on here!
Taking advantage of a no interest credit card is an excellent idea. That's like saying, "If you have to buy a house on credit, your too poor to afford on".
If you could buy a computer and pay 1699 up front cash today, or spread that payment out over 12 months, why would you ever choose the first option? If you spread it out you can take that 1699 and MAKE IT WORK FOR YOU, turn a profit on your money, and actually walk out ahead after the year. If you spend it up front on the computer it's gone.
Being a financial B.S. graduate i can tell you theres absolutely no reason why you wouldn't prefer to hold on to your money longer. It's just common economics, if you don't HAVE to pay all at once, you won't. Unless you mess up a payment, you'll pay no less in the end and you'll have had more opportunity to use that money to make MORE money, in turn giving you a discount over what you would initially pay up front.
The reason these cards get a bad wrap is because people miss a payment, lose their offer and pay interest. Stay on top of the card, always pay early (electronically is the smartest way), and you'll have spent 1699 in 12 months instead of in 1 day. Really, absolutely no reason NOT to use the card.