That Niterider light is totally the next generation from my HID light. The HID is great for output (it's like being half of a BMW) ind the NiMH battery has pretty long life (I've never experienced dimming, even after 3.5 hours, the farthest I've ridden in the dark in one go) and seems pretty resistant to cold (I've ridden in the low single digits a bunch of time)....BUT,the battery pack is a pain in the butt, and the light structure itself is quite heavy (a real distraction when mounted on the helmet).
One general problem with winter riding is that the new superlights are utterly blinding to oncoming traffic on the narrow confines of a bike trail, so much so that I only ride on roads with my HID light. This is partly basic courtesy, and partly common sense (a head-on collision between two adults on bikes at a combiked 30-40 mph ain't pretty).
