Agree with the links and the idea that projecting lower is better.....
I think my fogs helped just recently on a drive through the mountains in heavy fog.
I don't get a lot of fog where I live, but I do use the fogs and just running lights when there is light rain and I don't really need the HIDs...I like the idea that the front is lit (angel eyes and fogs) and the rear is lit (marker lights) and I'm not burning the HIDs for no reason. I want the lights on both ends, not so I can see, but so people can see me.