This rug is quite awesome. On one side it is stuck on the car dashboard (where else) and the other side, it keeps the laptop in place. With a rigid shell, even the portable vertical holds, if the latter is protected by a soft neoprene shell, membership is less strong and must not exceed 45 ° at the risk of the laptop down following the car's vibrations. Do not forget to clean the area of the dashboard where it will be installed with a dry cloth if you want a membership flawless. After use, I remove the carpet, reattached his card stock and covers it with its protective film (it's faster to do than write!) So I can use this rug on my second vehicle without problem. Otherwise, once installed on the dashboard, he can stay there ad vitam eternam. But after removing the laptop, consider covering it with the protective film because it fears the dust, hair, hair and other micro elements that will degrade performance. Be careful though when choosing the location to the presence of air-bags to avoid injury in case of triggering by a laptop atteidrait you in the face. I think when performance decreases (fouling, gentle washing should be able to return his qualities but I have not tried. I did not give it 5 stars because I still do not know his behavior over time and the effect of a wash when it no longer adhere. So I will be revising my rating in some time