Really only for looks
I purchased this because I know that EGR does a good job with "no drill" installations for their window vents and hood shields. Most others want you to apply their 3M tape to your vehicle's finish. Only problem is that on my 2016 JKU, the center plug that accepts a screw is undersized and hence not very stout, whereas the outer two plugs are. Additionally - and to be honest - there is no difference in the number of bugs impacting my windshield after installing this hood shield.
WIndblox Convertible Windscreen in Saab 900 Convertible
Works well! Doesn't eliminate all airflow to driver and passenger, but I wouldn't want it to -- if I'd wanted that, I'd put the top up. Not the prettiest (see the picture, but you don't see it when you're in the front seat. An extra set of hands would be handy when installing, to hold up one side while you secure the other, but I got it in place without help in all of around ten minutes, including adjusting the straps to hide the buckles under the headrests. Very pleased with my purchase.