These gimbals are cool and work well with the GH series cause theyre so small, i've never used one so I'm not sure how well it would work for skiing. My biggest concern is that the gimbal is trying to keep the camera completely still, so if you need to adjust the position of the camera (which happens basically every time you're filming skiing) the gimbal usually has a joystick or something to adjust, but its pretty abrupt. Some are built to automatically adjust when you move, but its pretty slow so that its not abrupt. Either way, both are unreliable in a quick situation.
Glidecams are the best stabilization tool for skiing IMO id suggest looking into one as well.