I just tried this out the other night and I like it a lot...rather have it on when it makes sense. It doesn't make sense in a lot of applications because the lens is actually kind of heavy so it won't work well in places where you need the GoPro to be as light as possible (like it won't work with the DJI H3-2D, H3-3D on Phantom, etc.) but for things like cars, etc. it's great. Will try out on my helmet at the track on Wed.