I have lived both systems and I will say that in my experience I'd take what we had in the US anyday!
I'm going to explain my observations the way I saw it. I know it is much more complicated than what we experienced but I had absolutely no complaints. I also didn't have a real complaints about the Canadian system ONCE you got into the specialist or whoever you needed to see. Here it's the wait time to get into see someone which I feel is the biggest problem (doctor shortages)
In the US, healthcare is something you have to plan for and pay for through insurance. Much like car insurance in this country ~ if you will. The reason a lot of people in the US don't have coverage is that they choose not to for various reasons, being self employed, not able to afford it, just don't think they'll need it, prioritize other expenditures. There is a great divide about those who would like to rely on the government for "help" and those who want little goverment intervention.
Having said that - it is a difference of "paying up front" or "paying through taxes" like we do. (I hesitated as I wanted to write paying a enormous amount of taxes.....but we all know what I mean

) It also depends in the US how good your plan/insurance is. And you get what you pay for.
DH had an excellent plan through his work in the US. They deducted about $250 per month for healthcare and we did have a $300. family deductable. So we paid (but got some back through a flexplan) for the first $300. of visits and the rest was free. Think much like the dentist is here. Now, you may think - wow that's a lot of money but we did the math and based on the upfront cost in the US versus the amount of tax we pay, we are paying far more in Canada - but the difference is it's hidden.
Another difference was the quality of care and the availability of care.
We had absolutely no problem getting a family doctor and the kids went directly to a pediatician. They were available to us every time we called with no wait and even on Saturday. The offices were run like businesses and we very nice, clean and even had a "sick" waiting room and a "well" waiting room. (I know this may not be typical, but it was our experience)
We had to "beg" our DS's pediatrician in Canada to take us back to his now "closed' practice when we were stuck for a doctor, and 2yrs later the rest of the family have just now found a family doctor.
If you needed to see a specialist in the US - you could have your Doctor refer you or you could call yourself.
When you went to the doctor's for an appointment the wait time was very little, and I was given a sincere appology once because the Doctor kept me waiting for 15 minutes. Plus I was offered a coffee or cold beverage while waiting!
They had clinic's all over the place for after hours care if needed.
Our DD broke her arm the first week we arrived in the US. Our hospital experience was incredible with her seeing a Pediatric Orthopedist, no question. They took the Xrays and brought them back to the room in 10 minutes - start to finish. We didn't know you could do that!! We did see the bill, however and it cost about $2,500 to break an arm!! DH's healthcare paid for everything, plus followup visits - less $90. deductable.
I found the care we had was for the most part preventative. They were trying to keep you healthy and prevent things or catching problems early. Example, most plans pay for yearly Mamograms after 40 yrs for no history, here it's 50. You can get an MIR same day or hour. Here....well you all know.
Bottom line is that I was much more comfortable with the availbility of care we had or could get if needed. And I'm more than willing to pay for it if it is my health. This is why I'd like the option of a private system. I'd rather pay, then die waiting.
Back to the OP -
I was truly surprised by the number of posters that feel that a universal health care system would be a catastrophe
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I didn't read the thread over at the CB, but my answer to this is because of the number of people a universal system would have to accomodate ~ 300 million+ It just couldn't sustain it without astromonical taxes.