We run with the fogs on 24/7. Its much easier to be seen with the lights on during the day. We have a v6 pony package and the fogs helped some at night but of course they would turn off with the high beams.
When we changed the front bumper we changed the grille and fog lights to the GT ones (didn't mean to get a GT bumper, just worked out that way). Not only do we now have the bigger fogs but I have them wired so they are on with the high beams.
The GT fogs really do make a big difference on the 2 lane twisty road to the house, and also help on the dirt road. Without it, it harder to see things (read animals) off the side of the road so having them on with the high beams now is really nice.
We rarely ever get flashed. I have the fogs adjusted so they don't shoot any farther than the low beams and also low enough that what does go into the other lane doesn't blind oncoming drivers.