I bought one of these for occasional use when sent on CERT missions. I recently had to use it to block a road and after I was done it seemed to stick to the roof well enough so I just left it there to see how it holds up under normal driving conditions. In short, it works great. ! 75-85 mph on top of a full size pickup truck wouldn't budge. I had a short run to 105mph and it held. I haven't noticed any water ingress and the light works great, especially considering the price. Several other members of my CERT team are now considering buying them. I agree with the poster that said to just get it already! I was not disappointed. However, it pulls away from the truck every time I drive through a car wash. I may be crazy enough to hit 100mph every once in a while, but I'm not stupid enough to think it'll keep going even after those hits.
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