We have hospital cover from Qantas but not extras, simply because the price of hospital cover was competitive but extras wasn't. However, how health insurance companies charge is a mystery to me (I first got a quote when we lived in WA and it was ridiculous ... a couple of years later we moved to Victoria, I got another quote and for some reason the price was several hundred dollars per year cheaper). So it's definitely worth getting a quote.
We've been in the unfortunate position of having to put in claims a few times over the years, and Qantas Insurance (which is actually NIB) has always been fantastic. They've been helpful before, during and after the hospitalisation, and we've never had any problems or disputes over payment or coverage.
I also love the Qantas Wellbeing app. It's a genuine motivation for me to keep my steps up, to exercise -- even to not use my phone at night. Together, my family of 4 earns well over 30,000 points per year just from using the app.
My advice would be to get it, if the price is right. Don't get it for the points, but see the points as a nice bonus.