Payed them to install a 1.9kW system in WA and I have to say they have very very bad customer service. They lied to keep me waiting with one excuse being "We're sorry but your order was sent but a wheel fell off the train and delayed it".
Eventually 1 month late and having me calling them weekly they finally had the system arranged and working.
The electrician they used is the best I've seen and the equipment is good but if you deal with them - don't except any level of customer service.

Approximate cost: $3300