Top critical review
Super cheaply made, but it's super cheap.
on September 25, 2012
Cheapest prime-eligible bike taillight at time of purchase. Battery replacement is easy, although the battery door is simply the red LED cover and isn't super securely attached. Haven't had any problems with it falling off on rough roads, however.
I did have to cut down some old inner tube to make additional shims to mount to a skinny seat post securely.
Although the taillight does not have much of a reflector in it, the LED's themselves are super bright and come with a ton of modes easily accessible with the rubber pushbutton. I especially like the reversible "chasing" function, which allows you to direct cars around you in a particular direction.
It's very cheaply made: the retaining slider that allows you to remove the light from the mount has already broken after a couple uses, but the light is still secure on the bracket for now.
For ~$5, I'm satisfied.