Yup, Razer is right. US Visa Debit is totally different. I am lucky enough to live on the border, so I have a Bank of America account just so I can use their visa debit and remain credit card free. It works EVERYWHERE. Canada's Visa Debit hardly works anywhere LOL and the banks excuse is that Visa Debit is a brand new technology.
The US doens't have the "INTERAC" brand like Canada and visa debit / MC Debit is a direct competitor of the INTERAC system. The banks up here are so in with INTERAC, I think that is why the credit card base debit systems are not being pushed as hard, a mix of lobbying by INTERAC and maybe contractual stuff with the banks?