they're over priced, to big, eat up batteries to quickly, to bright... no way can those over sized, bulky, over priced things even begin to compare to the versatility, convenience and economy of the Nitelite systems...
I have both a Lightforce and a Nitelite, and I love both. Either will last all night long, both are tough to carry if carrying in your hand, but both have a way to carry on your belt or shoulder. Both have a rheostat to adjust brightness. Nitelite costs less. Lightforce is brighter if you need light at a farther distance, or for lighting up an area after a shot, looking for blood.
Personally I prefer my Nitelight when hunting with a shotgun, as I can hold the light and gun comfortably at the same time. I prefer the Lightforce for rifle hunting (as my hand-held light) and for looking for animals or blood after a shot. Lightforce is also good for spotting deer.
In my opinion (everyone has their own opinion), both lights serve me well.