I like mine. It came with my bike. If I had bought a Monster without one, I would consider buying one. But I believe they're priced really HIGH for what they are.
On the freeway, when tucked in, I do notice the wind blast hitting the top of my helmet and when riding upright, the wind blast is right at my upper chest.
I have another bike (Harley) that is completely naked and the wind blast is all over. Though the riding positions are different.
I wish someone would make a carbon fiber replacement or tinted screen as no one really "looks through" the plastic.
2016 Ducati Monster 1200 R Thrilling Black.