I dined here a few months back whilst I was still in Sydney. I went with a friend because I had purchased a really cheap voucher from Scoopon
It was basically $10 per person for the buffet. Very cheap but the food was average. There was a lot of people there and so I assume they came because they also purchased the Scoopon.
Service was dismal. So in general I won't recommend anyone going to this restaurant unless they had a massive discount voucher, don't' have high expectations though.

Approximate cost: $avg