This is a must for everyone in Sydney, tourists and locals. You will enjoy a two minute 4D video before you're allowed up to the observation deck which offers 360 views of Sydney. You'll see the famous Coke sign in Kings Cross and Olympic Park from the top deck. It has an incredible view.
The only thing to be aware of is that the lines are ridiculous so you're best to buy tickets prior to arrival online. It's very reasonably priced. Make sure you take a camera with you to capture the images.