It has been over 10 years since I installed it, and I find it very useful as it provides strong ventilation and hardly discolors like the original product.
The disadvantage of installing them is that it can be a bit of a hassle to wipe off the water droplets when washing the car.
I guess it can't be helped since the shape of the product doesn't make it easy to wipe off.

As an aside, I was surprised when my colleagues at work saw the 8 equipped with this product and decided to install it in their own cars (MAZDA3, CX-5) as well.
He said he liked the design first and foremost, but after putting it on he was surprised at how well it ventilated it was.

●Eight Can (RX-8/SE) from Okayama Prefecture