If you feel the need to break some wind at your back, this screen certainly helps. I'd give it 5 stars it were automatic and built in, but you have to install it manually. It's pretty easy, but you need to stow it in the trunk and it's rather bulky. My my CLK350's trunk is very small and I can't afford to store it, or I lose too much space. And you absolutely cannot put any items on top of it or risk damaging the cloth screen. Once installed, it works great, and best with the windows up. Windows down, it has the potential to flop over if driving at highways speed or in high winds. I didn't experience this issue, but I've read others have had this occur. Visibility in your rearview mirror is diminished due to the screen, but it's sufficient. In lower light driving conditions, you might be better off removing it so there's no visibility issue. All-in-all, I like the quality, fit-and-finish, and it looks cool installed, but if I needed to remove or install it often, I'd opt to not use it at all as it will become a pain. If you must break some wind, this medicinal screen will certainly help!