Thanks for the things to think about. Some basic details:
I earn around 100K per annum. The mortgage I would sacrifice is around 10,300 per annum. We have no HECS/HELP debt. We have health insurance. Currently I am not tipping in extra to super due to current cash needs (renovations to save the house from falling down the hill). Under these circumstances it seems like a good idea to me, as it would give me around $3000 per year for no extra effort.
I know, I'm not investing in the right order. But I am also looking at saving where I can. I have signed up for their seminar next week, but a sales pitch may not give me all the possible negatives, so if anyone else can see a negative, please let me know.
Thanks everyone.