Thanks for the link Eclectic12
"However, if you hold these funds in an RRSP, you forfeit the exemption you would otherwise receive on foreign withholding taxes. That’s because the fund itself pays the withholding taxes: you don’t pay it directly. And because you’re investing in an RRSP, the fund won’t issue a T3 slip that would allow you to recover it."
"When you hold these in a taxable account, you can recover taxes withheld by the US-listed ETF, but those withheld by non-US countries are not recoverable. In an RRSP, you get two levels of withholding tax and neither is recoverable, which makes this structure particularly tax-inefficient for international equities."
So the bottom line is that individual US stocks held in an RRSP benefit from no withholding tax, where as this ETF`s does not. I`m sure there are many variables to consider if it makes sense to convert my CND VXC to USD VXC for the tax savings. Weak Canadian dollar, the premium banks charge to convert CND to USD etc etc