The lights work well in lower speed city driving conditions ...
921209
The lights work well in lower speed city driving conditions. They are very bright in the nearer distance. The lights seem to fade out more than halogens the further the distance. For example, interstate driving where the driver is using the further edge of the low beam these lights seem to be diluted, even compared to halogens. The high beam is reflecting the same height as the low beams, therefor they are essentially non existent. I will be returning these headlights and trying either the 80w version of new brights or the GTR headlights.
4108882
The lights are very dim. If you live in the country get some stronger ones. great for living in the city.
1253470
I'v been using these for about a half of year with good results. If it is dark outside then they provide plenty of light. If you are in an area with a lot of streetlights, they may not provide enough light to overpower the streetlights. For me, the main objective is to be seen so I like the flashing feature. The clamps are a bit cheesy though. The screw on the clamp had a bit of rust on it out of the package. I suspect that if you were in a rainy environment this would be a problem.
The tail lights are okay. Not super bright. I already a heavy duty tail light so I use these as a secondary flasher. They easy to mount to the bike or to most helmets.
3179208
The lights are bright and visible from over 500 feet.  Here in the North West it gets dark around 4:20pm at times so when riding and the sun goes down these lights make it easy to get home safely.
2970157
I ordered 2, have them positioned on each side of the handle bar and have them flashing a different speeds.  These work great for being noticed by motorist and pedestrians - which is why I bought them.  If you are biking trails at night, I doubt these will be strong enough.  But for the Chicago streets at night, they are ideal.
3435187
These headlights are an improvement over standard bulbs however don't expect extreme brightness. Also the life span of the bulbs is significantly less than that of regular bulbs. That being said they are helpful and provide a nice safe drive at night which makes them worth their costs.
1041976
These lights are decent quality lights, which use solar power during the day to charge a battery.  This means that they don't stay on all night (as the battery will wear down) and the brightness isn't as much as ones that are plugged in.  That being said, no problems yet.  I strung one up around my door area and another around my garage doors.

When the sun goes down, it senses no light and turn on automatically.  There are different settings (blink patterns) and they work pretty well.

They aren't great, but then I'm not giving any money to the electric company... so I have that going for me.
3609295
Using these on the undersides of our stairway handrails has given us much needed light where we have no outlets. In the week that we have used them, they have worked quite well.  Occasionally, the light doesn't turn on until you're close to the unit, but that's just the nature of low cost motion detectors.  The units are constructed well, although the battery compartment cover is a bit flimsy.  Overall I would recommend them.
4616678
I use these to control traffic on a federal facility during peak traffic hours. The PROS: they are extremely bright and can be seen from quite a distance away and in all types of weather thereby increasing user safety and visibility as well. They are also very light in weight so having to use these for a few hours isn't likely to present an issue. The CONS: they're not exactly weatherized so using them in the rain is likely to shorten their lifespan. While there is a rubber ring around the battery storage compartment (in the handle) water may still enter through the cap at the top of the baton. Being outdoors makes ruggedness a factor. If you drop them that may also cause malfunctions in the switches. All in all this is not a bad product and the low price mitigates the relatively cheap construction. So if you need traffic safety batons I would recommend giving these a try.
1981222
The lights work well and give off a nice yellowish glow.  Instantly turn on with no problems and work well in bad weather to see the road.
2596938
It's definitely worth the price.

The lights are bright and I didn't get the impression they go through batteries too fast.

They're not great. They're okay. They get the job done; cars will see you.

That being said, They're not great if you need a head light to see. The LEDs are set in different direction, so there's not a spot-illumination. It's probably fine for an unlit paved path, but I have on a couple occasions not seen a branch in the path.
319029
If you ride at night, then this is for you.  The twin headlamps and the two LED rear red lights you are easily seen.  I found it best to turn the rears on to slow blinking speed.  They almost look like they are alternating in sequence.
2535473
City riders will love these little guys. They're super bright, even when you're around cars, streetlights, and all that. Unfortunately, I'm only a city rider half the time, my town is actually fairly rural and there aren't many lights at night. For me, the rear light is just fine, I'm visible to drivers, but the headlight simply isn't bright enough for me to see very well. I use it regardless, but I'll be looking into a brighter headlight soon.
2122228
The lights worked very nicely, and are as bright as I wanted them to be.  I installed them outside, and after being exposed to cold and very rainy weather they still look good.  The only drawback I see is that they consume batteries at a high rate.  I have them on a timer, which means they are on for 6 hours per day and I have had to change the batteries weekly.  The other strange thing is that they are supposed to operate with 6 AA type batteries, but they started working fine after I inserted only 3 batteries.  I don't know if they are defective or so, but I am not complaining!
2997438
I bought these to use when driving at night, and as dusk when the lighting is low. They work very well at eliminating glare. Dusk + dark + rain = very bad conditions for driving, and these really help. I did not receive a glasses case, so you will need to buy a fairly large clam shell glasses case to protect these when not in use. Quality seems pretty good for the money, optics are great. As eyes age, night vision seems to get worse, these are a pretty good fix.
2875200
These lights work great along the south side of our house for illuminating the driveway that accesses our daylight basement entry.  My only complaint is that the motion detectors angle is somewhat narrow, so my original plan of spacing them about 15 feet apart left some dead space before the next light would activate.  A spacing of about 7 or 8 feet works wonderfully for walking down the driveway.  I liked them well enough that I added some going to the main entrance of the house for after dark deliveries or unexpected guests when the porch lights aren't on.  Mounted about 18" from the ground, they give off enough light to see where you are walking without being blinding to eyes that have adjusted to the dark.
4488357
The lights work Good and are straight forward to use. The LED circuit is all filled in with a plastic coating to resist vibration and moisture. The moldings appear to be a little cheap and the light is not as bright as a standard strobe. However I am tired of paying the prices for fancy lights that my drivers break off and destroy. These lights are just what I needed and I will reorder them.