I have had them installed for about 5 months now, and they have been amazing in low visibility situations. I have mentioned it before, but I will mention it again, as far as on road use they are not legal to have. That being said, I do use them on the road (LOL) with specific parameters. I basically treat them like hi-beams but for low visibility scenarios. No oncoming traffic, or when I am behind someone. I don't run them in populated areas at night. But I do run them with traffic
during the day only in low visibility situations so that I am as visible as I can be to other drivers, particularly on winding roads with blind corners. I don't use them at night in the same scenario because the light output would be too much, and I cannot guarantee I would be able to shut them off fast enough not to effect other people, so I just don't do it. So far, I haven't been "flashed" by oncoming drivers when using them during the day in bad weather. This is what I do, and it has worked well so far, but ultimately running them on the road is your decision and judgement call.
On the trail, they are fantastic. Plenty of light and they cut through dust from other vehicles very nicely. I would advocate the amber lens over white for the fog light position. White works better for distance in my experience and would be better suited for a spot or driving light versus a low-vis light.
Good luck!