Hi, I'm the poor owner of the Monaro, just thought I'd answer a couple of remarks here. The Roadhawk is actually not visible from the drivers seat, it sits behind the mirror. You can see it from the passenger seat but behind the mirror there are a couple of things e.g. the automatic headlight detector and the GPS ariel for the satnav. So it's not obvious what it is even from there.
I do have it plugged into the cig lighter socket in the arm rest between the seats. Thats not visible unless you open the arm rest.
It really is a good piece of kit, records G-force x,y and z, speed, GPS and of course video. I records about 20-30 hours of video on the 16GB card I have in there. The reason I bought it was the Monaro is a magnet for 17 year olds in turbo charged saxos who think it's great fun screech away at traffic lights. It happens so often that I thought sooner or later there'd be an accident and I might as well have it on video, for insurance purposes if nothing else.
and no I don't join in, I track the car from time to time that's far more fun than public roads and far less dangerous and of course no worries about the old bill pulling you over.