Wind noise is not too bad - better than the examples I have heard on Youtube, but then I've got open Akras & the Motobox
Biggest problem for me at the mo is camera shake, but then I am using the windscreen mount which is not that good (& its expensive)
So I've ordered some Ram mount stuff & will see how that works out.
Haven't tried it mounted on my helmet yet, am worried it will fall off - the camera that is...