The other problem with no-interest credit cards is that they are credit cards. This means you are still playing the game of the sharks who are charging you the obscene interest rates in the first place.
The goal is to get as much of your money as possible (that is the only way they make money)... and the reason they offer no-interest credit cards is because they think there is a good chance you will slip and owe them lots more money.
It's not that hard to beat them at their own game.
Sure they are hoping you slip up, so....you don't. Simple as that.
You pay them what they have to have, when they have to have it.
You look at the damn calander and do what you're supposed to do it.
You write yourself a note saying "Pay bills this weekend"
If you're unable to do that, remembering to do something when you're supposed to, then as far as I'm concerned you must be an Epsilon Minus.