Had a chance to do some night driving with the new fogs and headlights this weekend so I thought I'd share my impressions since this is the thread that kicked off my desire to make the switch. I was previously running the factory HID headlight bulbs and a pair of 6K Phillips LEDs in the fogs. I switched to Phillips 6K Utlinons in the headlights and the SRT LED fogs.
Conditions: Rain, light rain, fog, drizzle, and a little clear driving in both the city and some back country roads.
SRT Fogs: Wow. That's pretty much all I can say. The previous reports of how awesome the light output is were not exaggerated. I was happy with the Phillips LED fogs and wouldn't hesitate to recommend those bulbs but these integrated LED housings just blow them away. Great coverage and a very bright white light on the ground (bordering on a purple hue, imo). Great in all conditions.
6K Utlinons: I debated long and hard between the Osram 5K CBI bulbs and the more expensive Phillips 6K and ended up leaning towards the 6K simply because of how yellow my factory HIDs looked compared to my 6K LED fogs. I was worried that the 5K CBI wouldn't be enough of a difference vs the 4300K stock bulbs to compete with the new SRT fogs (which I anticipated being brighter than the LED bulbs). In the end, I don't think anything can compete with the SRT fogs but I think, from a color on the ground standpoint, the 6K is a decent match. The problem is, and it was one of my concerns going in, the lower lumens just get completely overpowered.
To me, the Utlinons left a lot to be desired at their price point. In the city, the streetlights seemed to easily wash out their beams. The same was true on the highway in the rain. The color on the ground didn't appear to be particularly bright or white. It wasn't until I was out of the city with less/no ambient light that I could tell the true color temp. If I had only these headlights and no fogs, it would have been hard to see in the rain and traffic of the city/highway (where you need your beams to cut shadows). At this point, I'm seriously considering switching to the CBIs but I have more money tied up in bulbs then I want until I sell my H11 fogs.
Overall: With the headlights and fog lights both on, the visibility was great. Much/most of that is owed to the fogs which are amazing but I thought the light from both blended very well. I noticed a difference in the color temp (with the headlights looking almost yellow vs the almost purple hue of the fogs) only when I toggled the fogs on/off. With both on, my eyes didn't naturally notice a definitive cutoff between the two (like they did with my previous stock bulbs and 6K led fogs). However, I think some of that might be because of the lackluster performance of the Utlinons.
The above thoughts are based solely on my impressions from behind the wheel. I didn't drive up to a wall to compare color (don't have a garage) or get out to take pictures (it was raining!). Whenever I saw my reflection in another car, both heads/fogs looked bright white (no tint). I am, by no means, a bulb expert (or color expert). I threw a pair of Phillips Xtreme Vision in my old car probably 10 years ago and didn't mess with them (except to replace a bulb) for as long as I had it.
TL/DR: SRT Fogs
Phillips 6K Utlinons.. eh, not impressed.