We moved to Australia about 5 years ago, having never ever been there. DH was head-hunted for a job and we moved out here about 8 weeks after the idea was first suggested. It was damned hard, I can tell you!
My parents & siblings have always been really supportive but DH's family are a different matter. They tried to lay the guilt on quite thickly initially.
As for quality of life? I wouldn't say it's better, it's just different. When we lived in the UK DH worked 1.5 hours away from where we lived and also regularly worked in different places around the country, going away for a week at a time. He hardly ever saw DD and me. It wasn't good for us as a couple or as a family.
Nowadays, we live in a really nice suburb - about a 10minute drive from his office (which is about 20mins on the bus), got a lovely beach about 5 minutes walk from our place, can catch the ferry across the harbour to the city (maybe 20mins away).
DH works quite long hours still, it's the nature of his job, but because we are able to live so close to his work, it's not too bad. Unless he has a 7.30am meeting (or a 6.30 flight to Melbourne like earlier this week LOL) the children see him in the mornings. And he is mostly home in time to see them in the evenings.
Most of all, come the weekend he isn't as knackered as he was when he had to drive so much so it's a better quality of life for all of us.
BUT I do hate those "wanted down under" shows - they are ridiculous. I think a lot of people forget that we still have to cook, clean, go shopping and pay bills over here. Life goes on.
As is often said on the British Expat forum - same shit, different bucket