I'm signed up with Southern California Kaiser Permanente, which is as close as you come to the Canadian medicare system I grew up under and the NHS system I lived under for more than a decade. Broadly speaking, I *really* like KP. Its app - while terrible - isn't as terrible as the other apps, and they've taken very good care of me for both routine things like vaccinations and checkups, and serious stuff, like a double hip replacement.
4/