We're Americans who moved to Australia for better quality of life. We certainly won't move back to the US. It's much safer here, with a much greater access to nature, and higher pay. Plus, the political discourse in the US is so divisive - it infects everything. In Australia, you have a mix on the political spectrum but at least you are not dealing with idiots who claim everything is fake news. Plus the health care here is so much better, as is the educational system.
The downsides? Bullying is rife here - much worse than in the US (and New Zealand, where we also lived). There's a bit of mentality that you expect to either be a bully, or be bullied. I've seen people treated horrifically on the job - if they were in the US, they would sue for millions of dollars and win. So that type of behavior is much rarer in the US because you could be held accountable.
The other two main downsides: shopping and home prices. I do miss shopping in the US but I go back at least once a year for work, so I just bring empty suitcases and fill them up with bargains. Also, I do find the home prices in Australia absolutely unbelievable -- and if the bubble does burst, all the people with upside-down mortgages will be in trouble. In the US, if you walk away from a mortgage for financial reasons, it goes onto your credit report, but that's it. Australia takes a much harsher tack.
That said, we wouldn't move back to the US for anything, even though we miss family and friends. Australia is a far better place to live and raise kids -- just have to bully-proof them.