I hadn't heard of problems with Niterider, "enlightenment" please? All of my lights are several years old. I have Niterider and Vistalite and Petzl. I haven't had problems with these, except that I would like even more light. The brightest that I have is 15 watt halogen. I haven't seen any of the new HID systems in action. I did crash hard 2 weeks ago in the dark when I didn't see that a road that I ride frequently had just been repaved and I crashed at the 4" high junction between the old pavement and the new pavement. The bike got knocked out from under me and I hit the pavement before I even knew what happened. Not fun to find yourself lying in the middle of the road at 5 am thinking that you broke your arm (it's ok).
I sure would like to know if the HID systems really do light up the road as well as a car headlight. I would get one despite the very high price if I knew it would really work and be reliable.