I know it's just anecdotal evidence, but everyone I know from Canada that has had to get any major surgery has come over to the US. The reason? the waiting list is too long (in the years). Most universal health care advocates will deny this, but I just can't ignore it when I've seen it happen so many times.
I would rather have a system with no insurance companies that we paid for ourselves. This way, Doctors would be forced to charge affordable rates.