Done it! It's lovely!
...Top tip for you (& one well worth taking note of), go early March (ish) and get tickets for Azure; Sydney's harbourside party (part of Mardi Gras and better than the event itself - sells out in seconds). It's outdoors and on the botannical gardens boasting the best views of opera house and harbour bridge, '000s of people, a gorgeous sunset and party production like you've never seen in your life.
I can honestly say it's one of the most impressive parties I've EVER been to.