During the conversion, you will also incur currency conversion costs. (thechinfamily.hk)
Another minor negative, as a Canadian you have to pay currency conversion costs on buy and sell, and on distributions. (canadiancapitalist.com)
In fact, with 50 percent of the portfolio in US ETFs, the portfolio took an initial 0.75 % (50 % of 1.5 %) hit in currency conversion costs alone. (canadiancapitalist.com)