I wouldn't worry about it if the condensation is of the "fog" type, which will dissapear after a few minutes. I have it on mine as well if the humidity in the air is high...like when it's raining. It's true that the headlights are sealed, but there are vent holes in them, which is why you see minor "fogging". On the other hand, if the condensation is of the water droplet size or if it doesn't clear up after a few minutes, then you should hit up the dealer for a replacement.