Indeed this was the purpose of the test (GoPro has no view finder). This was on top of the roll bar, tomorrow will try it slung underneath ans see what that's like. Will also try on top again but with a the extender in to take it up higher.
Nick
I was gonna say the same as Chuff: nicely exposed car interior shot, but not so good for forward view. Obviously the constantly changing light is difficult to deal with, but loads of cameras would struggle to deal with it.
I would watch out for wobble with an extender on top of your roll bar, the extra length might make the footage too wobbly.
Rear facing could be interesting, how about mounted on top of the boot lid?