I wasn't happy Canada switched to the metric system. Not that it is difficult but I prefer the Imperial system. And it's funny because the Imperial system is still used as much in Canada in retail as the metric system. Pounds, ounces, feet, and inches are used in all grocery stores, building outlets/stores and construction.
My son is amazed how I can switch from Imperial to metric, or from metric to Imperial without blinking an eye, LOL. He knows only the metric system, but he does know pounds, feet and inches well enough to get through it.