This is my 3rd year using this. It works great. Though my Hero Session, little square go pro, is thicker and the aim is too far down. I havent messed with it though because I just use the regular go pro's on the ProShot.
I like being able to see the cam, if its on or even still on my helmet. The field of view is, IMO, better as well. See's what your eyes are seeing better than if cam is on a side. And dont see any of the helmet in the view.