Back to the windscreen for a moment
I am fully aware that the "perfect" screen doesn't exist but as an all weather rider I would prefer something to keep the rain and snow off just a bit. In the winter I'll also attach a set of lowers to the forks to deflect some of the nasties.
I've got 5 different helmets, a modular for winter, an open face for spring and fall, and shorties of various lengths. I'm still not happy with any of them.