Pros: - includes a reflector, so it can replace all your tail safety gear. this is actually a difficult feature to find!
- bright!
- noticeable blink modes, but not obnoxious.
- seems reasonably weatherproof, with a rubber gasket and power button.

Cons: - crap mounting. after a few days of riding, the light popped off when going over a curb. i had to retrieve batteries and parts from the road, but the light still works.
- the angle adjustment needs some serious torque to set it securely.
- button is kinda squishy, so you can't just reach back and blindly click it on.

Other Thoughts: i fixed mine to the mounting by using a nylon zip tie around the top and bottom (not sides), partially passing through the mount. it holds it very well, discourages theft, and can be slipped off to replace the batteries.
the angle adjustment is best fixed with some thread locker or super glue. the amount of torque needed to set it is a little scary, so i'd rather glue it than break it.

Bottomline: this looks like the best light on here.

Pros: Good build quality, better than the standard DX quality items
Very bright light!
3 different light functions (butterfly mode, flashing, solid)
Good battery life

Cons: A bit pricey
Hard to insert batteries
Not sure if it's 100% waterproof
Not very useful for me since I don't ride my bike in the dark often
Light clip a bit flimsy, had to superglue so that I know for sure that the light won't fall off.

Other Thoughts: Somewhat fast shipping, also DX was nice enough to send me another one after my first one broke because of the bad clip that caused it to fall off my bike.

Bottomline: Buy this light over other ones on DX! You will not regret it!!

Pros: It has 3 functions. Constant, blink, or strobe. It is very very visible and looks really good.

Cons: Can't really see during day time and very hard to put on and to figure out how to put on because no instructions just picture of how to turn it on. It is also very loose but does come with some spacers but that didn't help because the nuts and bolts. You may have to remove your old original reflector off your bike if it has one.

Other Thoughts:

Bottomline: Mine fell off probably with a few slight bumps along the road and so lost like 10 bucks for meeeeeeeeeeeeeee.

Pros: Very good and strong light

simple to use

Cons: same standard back mount as all the rest: very easy to break

Other Thoughts:

Bottomline: worth it.