I have considered HID's in clear aftermarket headlight buckets but think the way to go is HID with a projector retrofit (in clear aftermarket buckets) as it will provide a better low beam cut off line for on coming traffic as well as better overall lighting (at least from what I read on here and other sites). In the interim (as majority of my driving is rural/remote areas of BC, Canada), I have for distance installed over bumper HID's from VisionX 8500 series (2 X 8.5" 35 watt euro beam) and 6550 series (2 X 6.5" 50 watt euro beam). In terms of lighting up the road in front of you from tree edge to tree edge and as far as you can see down the road these work very well indeed. These lights have literally saved my life on countless occasions. First is through seeing animals not only far out in front but also in the ditches and at tree lines on right of ways of highways. Second because of the brightness game and domestic animals have shown a tendency to stand still. Third less eye strain night driving, as you know when night driving (least for me) I'm always searching the area just at the limit of the lights (stock or low beams) with these HiD's there is a significant area illuminated out front and to the side which provides for much less eye strain because you can see more features at a greater distance, which provides improved decision making options when encountering animals. While traveling home from hunting this fall stock lights on gravel road max safe speed 60 km/h with HiD's on, fast as you wanted to go....
in terms of OP question as to worth it and expense.... for me yes VisionX products are high cost, however when I factor in family safety, animal safety and significant reduction in driver fatigue they are worth every penny to me.
jrc