Alan06SUT,
I just got my 580's installed and tested them out for the first time tonight at night. I went with two fogs on the outside of the warn bar and two drivers in the middle.
They are nice and bright. The color is much whiter than the stock headlamps. I can't tell if it has a blue tint like others have suggested as there's just too much brilliantly white snow here to tell for sure.
I got the lights on e-bay. One was last model year and the other the current model year. There was a design change in the black covers. The newer ones are glossier. I emailed PIAA and they are sending me a second set of the new glossier ones free of charge. Great deal, PIAA was very generous about this.
I haven't fine tuned the aim, but my rough mounting of the drivers happened to put them both nearly overlapping at the center of the hotspots about 200 feet away and they don't seem to bleed too much off to the sides. So I might put off doing pencils for a while. I haven't tried it out on the highway much yet, though.
My camera's getting repaired due to a faulty Sony CCD, so I haven't taken any pictures of the light patterns, but I plan to once I get it back.
I haven't yet replaced the stock PIAA switches. I found some DC rated mini rockers small enough so I think I can put two of them side-by-side into the "blank" below the rear washer switch instead of using the larger, round radio shack style rockers that most people have used (picts on next posts).
Stylewise, they're a departure from the dash style, but I think they'll fit okay. I found them
here for about $4.50 a piece (follow the second link in the body for "mini rocker switches.") I take the plunge tomorrow to hack up my switch assemby and find out if this'll work for sure.