Here's some opinions who lived in China until 12 years old.
Pros:
-lots of Asian chicks
-much, much, better transport, but obviously more crowded too. Cityfail sucks
-livelihood I guess, shops don't close at like 5
-food, I love Asian food but I guess the variety in Aus isn't all bad
-better net lol, but can't play games like mw3 because everyone is in America =.=
-has nukes, will probably survive WW3, not sure about Australia though...
Cons:
-air quality
-noise pollution
-lack of medicare
-lots of HW in school but that doesn't really apply to you anymore
-you look like everyone else
-hard to find jobs, competition much higher
-stuck in apartments forever...unless you're uber rich
-all you're money get owned by exchange rate