Converted my Cheque account to a Fusion account today. Did not get much joy from my application on the 8th. There systems were not ready.

I submitted a request to have my credit card account closed at the same time. Will see how this products works out.
The credit facility seems to function like an overdraft. So as long as you have a positive balance there will be no interest to pay even if withdrawing money with your card. Only once you are in the negative will you start paying interest on transactions. Obviously for purchases via the card the 30 days interest free clause will apply.