I think the "problems" with Niterider were from a few years ago, when they first started producing NiMH batteries.

I have both handlebar-mount and helmet mounted Niterider lights. I did have to replace the small (helmet) battery pack. Somehow I ended up with the one in the grey "wrapper" (made for police dept.s) and it's been trouble-free so far.

Other lights I've owned include Turbocat and Vistalight. I actually still use an old Vistalight (with the Niterider battery pack) as my helmet light because they are lighter and less bulky. Maybe I'm just weird, but heavy helmet lights give me a headache.

I have to say I really really recommend both a bar light and a helmet light for riding "serious" trails at night. You get to see both depth and look around corners and obstacles and you have two battery packs to rely on (once you've hiked out in complete darkness after your battery dies you'll appreciate the beauty of
this!).

I too have heard really good things about Jet Lights and Light and Motion.

Whatever you choose, have fun in the dark