Hi and welcome Tayla94,
I went to Stephen Watson, and believe that he is a nice person and a good surgeon, but forget it as far as support and follow-up.
Also, nursing care and general communication at SJOGM is very poor. And scary.
My "sleeve-sister" who I met through this forum @juldon1 is very happy with Leon Cohen, and I have to say has a wonderful team, great pre-and post-op support.
I'm not with HBF, so can't comment.
I have top level medibank and had a $3050 gap with Dr Watson, and $1500 with his anaesthetist. You will also cop gap fees for blood tests taken in hospital and for pathology.
Hope this helps,