Of course this is just like, my opinion man... but I think those of you who have stuck HIDs in your halogen housings are either annoying the crap out of people or have your aim cranked way down to a useless level.
I just got back from test driving with my 4300K HID kit from the forums' favorite vendor. Props to them, it all feels and looks like pretty good quality stuff. Beam pattern looked fine in the garage, similar shape to the halogens just much brighter. The bulbs fit in perfect so the shadow cast by the thing that runs alongside the glass tube is pointed straight up. I cranked the aiming knobs down 3 full turns, making the cutoff way lower. Stock it was up on the tree trunks way ahead, now it's down on the road.
3 out of 10 cars flashed me within a few minutes.
Needless to say probably, this has not happened with the halogens. Grabbed a buddy. Opinion was "yeah those are pretty bright". We traded cars and I'm of the opinion that they are at the "are those high beams?" level of brightness. You know how some cars just have really bright headlights stock, enough to annoy you when they pass by? It's like that, maybe a hair worse.
But with the aim cranked down, the actual distance being lit up is noticeably less. What is lit is obviously nice and bright, but what's the point if you're gonna reduce your overall sight distance and be obnoxious?
I know halogen housings are designed to throw some light above the main cutoff to light up signs and stuff. But with more than 2x the lumens it just seems to be a bit much. I think I'm going to just go with a pair of fancier halogens like Silverstars and deal with them burning out often, as they do.
I installed a 4300K HID kit myself a few weeks ago. I waited a long time before getting it because I too was worried about blinding others. So I waited for feedback from members who were installing the kit, onroad pics, etc...
I'm loving mine thus far, and that includes reactions (or the lack of...) from oncoming drivers. I turned my aim down 2 full turns, my cutoff is about 40' in front on the Jeep. I find it a little low, but I know I can't go higher : the Cherokee bobs up and down quite a bit over bumps I've noticed, and headlight aim is just right as it is ; any higher I would be annoying others.
The beam pattern is, unfortunately, center heavy. Cutoff on these projectors, on the other hand, is crisp and there is none of the traditional halogen reflector bleed up.
For comparison, I look at my wife's car, a Beetle with bi-xenons. The aim on hers (and the Beetle has auto levelling) is even lower than how I have it on the Cherokee. I think it is actually too low, but I think the Germans like it that way. High beam on hers is pretty much aimed as mine is.
So to better evaluate your situation, I need to ask a few questions, if you don't mind :
1) How low is your aim right now ? Onroad pics would really help here, from a flat dark road if possible. Low vs High beam.
2) Do you vary load onboard the Jeep a lot ? Meaning, load up a bunch of people or cargo, or both. This could help explain a sudden rise in headlight aim, resulting in flashing.
3) Do you drive with the fog lights On ?
4) (added late) : what tool did you use to adjust the aim ?
5) (added even later) : which bulbs did you get ? Regular 4300K xenons or Philips 4300K xenons ?
FWIW : I've seen pics from OEM Cherokee HIDs and the beam pattern is very similar to what the halogen projectors with xenon bulbs produce, meaning hot in the middle with a very similar/crisp cutoff.