I have them and like them. They fit perfectly - they come in a pouch and unfold to fit perfectly in the grooves around the pano roof (like those little wire and cloth frisbees that fold up into a small sack). Takes about 30 seconds to install in each section and less time to take out. Yes, I think they work well - especially if I leave my car out all day in the sun. And what I really like them for is to be able to open the sun roof and not have any bugs, birds, debris, etc. fall into the car.