What are the best day spas in Sydney and why?

I'm not convinced that Sydney has a lot to offer in this space.What are the best day spas in Sydney and why?
There's one in Bondi Junction on the gym level that's really nice. I've been thre a few times but since I don't live in Sydney anymore I've forgetten what it's called. Jackie O is one of their customers though, I read that in a magazine after I started going there...