Yes, i recently had a conversation with Canadians and Brits on universal health care in their countries.
Canadians:
It works, but you have to wait a long time for specialized services. Sometimes they offer MRI at odd hours, so if you are willing to see get a MRI at 2am you can get it done faster.
We are having trouble keeping doctors in specialized fields. In a few years much of it will be privatized, it will have to be.
Brits:
It's adequate. If you want to get faster service, private practices that you have to pay for are available.