[ZenGum]

My mate's brother is a sparky who does a lot of work installing these and I have asked him about it.
If I understand correctly, the deal you are looking at does not technically produce electricity that is fed into your house. For that you need an inverter which costs big bucks. You'd also want batteries. This package does NOT deliver self sufficiency. If there is a blackout, you will still have no electricity.

However, you will be selling electricity back into the grid and getting money for it. It should pay itself off quite quickly - probably longer than 15 months, but then it is free money AND you're being nice to the Earth.

It is very important that you have some good NORTH FACING roof space that isn't shaded by trees. Given the angle of the sun, especially in winter, the trees don't need to be overhanging the house to reduce your insolation, just nearby and tall. If your roof faces East or West you will get a lot less power from it and your investment might take much longer to pay itself off.

The only other concern I have is about damage - hail, wind, electrical fault/fire or bushfire. If the unit is destroyed early in its lifetime, you may be looking at a loss.

I'd say, go for it! But also consider insurance for the panels.