I had installed a cheap HID kit which worked great in town for brightness, but once you go out on a highway trip where there's no streetlights, unless you aim them upward (and that bothers other drivers) they're pretty well not good, since most kits (unless you spend the money to go bi-xenon) are useless, and are for bright looks in the city only.
I only did that because I couldn't find any decent 9004 bulbs that were bright enough or that burn out quick.
I just completed this tutorial and now my daylights are back (i didn't care much about that anyway, but if a cop is smart and knows the year of my truck I MIGHT have gotten a ticket) and now I can use my highbeams on the highway at night, and see far ahead, instead of really bright close up.
Great tutorial Mr. Wizard!