Canada's Tim Horton's has managed to sucessfully cross the border with locations in the US while Krispy Kream has had to close up shop in Canada. I live in Perth, Western Australia and when people fly in from Melbourne they bring Krispy Kream donuts(can't get them here in WA). People here rave about them.
I finally tasted them today. I now know why Tim Horton's does so well in the US AND in Canada. They are simply the best.