This has been a major embarrassment to the govt, especially given that it's an election year. Hundreds of fly by night backyard companies sprung up out of nowhere when the rebates were announced. One story I heard was of an installer getting his kids to go into the roof to put down the insulation while he sat outside. Apparently the qualifications required were pretty much nil and there were no inspections afterwards. Then there was a couple of installers who died of heatstroke putting in batts in the middle of summer.
Of late the live foil issue has surfaced and now millions will be spent inspection all such installations and fitting earth leakage breakers at those houses.
When someone goes around willy nilly with a staple gun in a roof not knowing what's under the foil, it's bound to penetrate the TPS cable.
The results were exactly as predicted.
Personally, I didn't take 'advantage' of the scheme as my house is already insulated with fibreglass batts, and I prefer to do any work on my house myself.
