I dunno who the 140lm tail light is aimed at. If someone hits you with your superflash or an LD1100 pointing at them it is a miracle they haven't run into someone else or a tree already.
Runtimes where you don't have to change batteries mid ride is nice too.
Looking at the very cool picture near the end of the page
here I don't see a bike, I see a red spot somewhere behind the bike.
Maybe I have time to pull out before that funny-red-spot-not-really-sure-what-it-is gets to the intersection.
Splat.