Hi purpleshow,
When you travel with just your COPR and passport, doesn't the officer ask you for the PR Travel document?
I thought you needed that to get in, even for visa-exempt countries.
What will you do if you still to travel after March 15th, since there will be need for a eTA visa for visa-exempt counties?
Starting March 15, 2016, visa-exempt foreign nationals who fly to or transit through Canada will need an Electronic Travel Authorization (eTA). Exceptions include U.S. citizens and travellers with a valid visa.
http://www.cic.gc.ca/english/visit/eta.asp