My Brother thought he'd take advantage of this offer for his rental house. He got 3 quotes and all three were magically $1600 (think this was the initial rebate). He thought this a bit strange and finally got another installer to quote.
This fourth installer must have actually visited the property because he reported back that the house was already insulated and would only have cost about $800 to do anyway (honesty is not completely dead). This rebate was being rorted and I think that's why it went down to $1200
