I have the plexi. I think it's a bit over priced but... It's contoured to the car, it is often barely even visable, it definitely reduces wind noice on the highway (main reason I bought it), and I'm thinking when you're using the heat with the top down it might make keep a little more heat in than the mesh??

They make a HUGE difference on the highway - you can have a conversation or listen to the radio without hearing all the wind baffle.