If you miss the big shiny sky-ball your mother told you not to look at when weaving your bike through downtown traffic after last call then buy this light.
650 lumens is as bright as a car headlight. Not only does it reveal potholes before they wreck your shit, it also warns the "2 beers ociffer!" street companions of your existence before they're picking your teeth out of their grill.
Construction quality and materials are top notch, battery life is great, side lights for cross traffic, micro USB to charge, and can be used as a headlamp when your camping rig just won't cut it.
It's so good I let it get stolen downtown just to have the privilege of buying it again.