One of the points to consider, of course, is how much you are at risk in Canada, compared to the United States.
In Canada, doctor's fees are controlled by the Govt. so a regular operation for an emergency like a gallbladder attack or an appendix is going to cost a good bit under $1000 for the surgeon's fee. Hospital bed days used to be $400 per day (I'm out of date on this). It is the reverse of when Canadians go to the US----we have to insure for the worst possible occurrence which might cost $30K, $50K, $100K etc. and on up.
Americans in Canada would have difficulty pushing a medical bill above $10K for routine emergencies. And if you discover that you need a heart bypass or an esophagectomy, then you have the option of going home, in most cases.
It's a tricky problem, because you may be faced with something cataclysmic, like a stroke/brain haemorrhage, but in no instance will you be refused treatment.
It's a situation where you may want to consider a limit on your coverage, whereas Canadians in the US have no such option.
Just my 2c
Rankjo
(ex-vascular surgeon)