Great light, but I worry about the durability of the attachment system.
933923
Quite pleased with the light itself.  Plenty of light to both see and be seen out there, with enough options for you to set it to a level appropriate to the light levels that you're riding in.

My only real worry with the light is the long term durability of the mounting strap.  It's held up pretty well in the few months that I've had it, but I can see it being a weak point potentially.  Personally I'd like to see some sort of a system where the strap could be cinched down onto the bars, and then left there semi-permanently, with a clip for the head unit to be easily removed and reattached.

Hopefully I'm just being paranoid, as I really like this one.
4521085
These light would be  excellent, but  the adhesive backing doesn't last more than a week or two before you start hearing or seeing these lights fall off, and in some instances break and stop working.
2544054
It hurts my feelings to have to give this a three star review - but please read completely to understand why.

The light is great. It's a 90 lumen pen light made with a VERY strong outer case. I bought one for myself and one for my friend that works in a welding shop. Both of us carry ours every day non-stop all day. We bought them in October of 2015. By January 2016 they both had the same problem. The actuator (button) you press to turn the light on was wearing out. It's safe to say we probably use them at least once a day, sometimes 15 or 20 times a day.  I'm a network installer, so I'm using mine constantly some days on the job. No, it's not a flood light.. it's not 950 lumens. It's not meant to be the brightest on the market, but as a guy that has WAY too many flashlights purchased in the ongoing quest to find the perfect one, this is the one I carry every single day everywhere I go.

Battery Life: I'm more than satisfied with the battery life. I run 2600 mAh rechargables in mine and I usually change them just out of habit long before they're dead, but you'll be happy with the performance of them.

Sturdiness of the housing: You could probably drive a truck over it and not break it.

Pocket Clip: Pay attention when you're changing the battery. The pocket-clip is simply tighly fitted to the top of the light, so when you take the cap off it could come loose and you wouldn't notice it until later. ( I spent 20 minutes running around the garage looking for mine, but found it.)

Manufacturer Response: When I emailed the manufacturer about the actuator issue I heard back within a day. I noticed on their website they have a lifetime guarantee on the product, so I mentioned my issue and inquired about a replacement button cap. The response was apologetic and quick. They offered to send me a new cap as soon as they were back in stock. They're currently back ordered for four months on them apparently. In the meantime I ordered another from Amazon to replace it. I guess I'll eventually have two of 'em!

As far as how much I like the concept and the battery life, I'd give it 5 stars.
The cap issue is why I  gave it three. I don't think this is an issue that will resolve itself. I think it's a design flaw that they probably need to change if they're going to offer a lifetime warranty on the product. Either that or people like me will keep having to order free replacement caps every few months. Maybe they should sell those separately? lol. If you're a casual user that puts this on the dashboard and rarely uses it, you'll probably be fine for life. If you're someone that needs a flashlight daily as part of their job, you'll be hard pressed to find a more convenient one to carry -but you'll have to deal with the cap issue. Again though - I liked it so much I bought a second one to use while my first one is out of commission if that tells you anything.
1568255
4-stars for great price and bright light. Didn't work when I first tried it. After bending out the contacts of the housing switch assembly, it lit up fine. I question it's durability, the lens/light/cap assembly is not at all robust. I doubt it would survive much of a fall.
3253780
Great light; Crappy Attachment

I have had two and on both; the plastic attachment snapped and rendered them useless.

If you have the luxury of leaving them on your bike without fear of getting stolen, they are great, if not, keep looking, the attachment to the stem will break in less than a month
3028374
The light is good overall.  Solid construction with a powerful light using a single AA battery in a very compact frame.  The only gripe I have is the lens seems to be made of plastic and mine has a big scratch on it.  I'd imagine if one carries this light in one's pocket or purse over the course of the light's lifetime, the lens will be so scuffed that light output will be greatly diminished. Fenix should have used glass as lens cover.
1597465
They are really nice lights, I like them alot.  However, the point at the end of the post breaks easily.  They need to make it a metal part instead of a plastic part.
2452331
I love having this little light in my camera bag, but I've broken 2 of them in the last year, due to the relatively flimsy construction of the light's thin plastic base.  On this video light the base is all important, as it where the power originates, and once it's broken, it's broken; time for a new one. The low cost makes it relatively painless to replace, but still.. Oh yes, how did I break it?  Once by putting the camera into it's bag with the light still attached, and also by someone brushing against the camera when it was on my shoulder.  It's great to have, but be very careful to put it away when you are not using it.

For the future I urge Sony to create an LED version with lower power consumption, variable brightness and a stronger base, but meanwhile, it's a must-have in any camera bag.
573238
Ordered this light in January 2015.  First impressions were awesome.  Super bright for its size, weighs next to nothing, so it was a breeze to hang on the lanyard I wear at work.  I walk into a lot of dark buildings for my job, and this light has saved me from groping around for light switches countless times.

About a year in, the strobe feature just flat stopped working.  Not that I used it much, but nevertheless, that's a feature that just disappeared.  I also noticed that the outer coating on the rubber bits (button, USB dust cover, keyring tab) seemed to be peeling away.

18 months in, and the rubberized piece that holds the keychain to the unit just fell apart.  No stress, no trauma.  Just fell apart when I picked up my lanyard from the seat of the car.  The rubber tab it connects to was glued to the shell of the unit, and the hollow piece on the end just crumbled away.

The unit still works great as a super-portable emergency flashlight, but without the keyring connected, it's somewhat less useful.  And it looks like there isn't much room inside the case for me to attempt to drill a hole & secure a keyring some other way, so I'm not left shopping for a new mini light.

If this unit had a more secure/durable keyring, it would be 4 stars.  The strobe going AWOL took another star for me.
2923023
I like how bright this light is, though it's still not "super" bright. I use two of them at the same time and I guess this is going to be as bright as one can hope for with something of this size. So anyone complaining about the brightness just needs to accept that if you want BRIGHT, then you need to buy a fairly large lamp.

My problem, however, is that I've had the battery's die 3 times now after probably 8-10 hours of use (combination of flashing and solid lighting). I think this is much less than advertised.

Also, I have a problem with them just suddenly turning off during a ride without pressing the button.

Lastly, these clamp just fine to any round tube. That's good if you have a round handlebar. Does not fit at all on anything on my aero bike though. Solution requires getting those round bike computer mounts and attaching those perpendicularly to my front facing aero bars. At least the quick release thing on these lights makes it easy to attach/remove and those computer mounts are relatively easy to attach/remove.
4901085
This light was great to me while it was fully functional - it's bright, compact, and made me feel much safer riding at night. However, after using it for three months, I rode over a particularly deep pothole by mistake and the bump caused the front part of the light to fly off at high speed. No matter, I'd just put it back on, right? Nope, after that one event I had to tape it closed with several layers of electrical tape to keep it from spontaneously going into orbit during a ride. Subsequently, the next time I went on a ride in pouring rain the whole thing became filled with water and would not turn off. I removed the batteries and let the whole thing dry, but it seems to have died. I expected more from something so well reviewed!
3157055
I've had these lights for nearly two months.  Overall, the brightness of the lights is great.  Absolutely no complaints, but while moving and readjusting them I've already snapped 2 of 3.  The connection from the light to the shaft is poor at best.  Buy some super glue if you're going to invest in these.
1242638
This light turned out to be great!  I honestly wasn't expecting much light output on it, but it does give quite a bit.  I love that it has dual modes for lighting, one with the typical pinkish grow light hues and one with a warm, natural lighting.  The only reason I give it a four star rating is because the clamp part of the light had an issue.  The rubber pad in the clamp was put on with a poor adhesive and did not stay on.  In fact, it came off after just two uses.  It's not huge problem, as it could easily be glued back on, but I do get quite disappointed when something goes wrong with a product after only a few uses.
4229436
I am still waiting for my old halogen light to burn out, to mount this new LED. I have three of their lights mounted and in use. The lights great, but I would suggest running a bead of silicone around the weather seal, as two of the lights have leaked in rain water and went dim.
1906942
Though the light and flasher worked well, I lost 2 of these because the attachment to the mounting unit evidently isn't secure.
817279
As spare lights you can throw in a drawer to use in a pinch they're great. I use them for walking the dog and around the house when I need a little extra light. As other reviewers have reported, the durability is questionable. Two months after buying them, one has died, but at a few bucks apiece it's still a good deal. I wouldn't use them for anything where your life would depend on it - for that kind of application get a Maglite or Surefire.
162042
Great light, very bright. I have just a few problems with this product.
1) Wiring harness has to be purchased separately, and the instructions for installation are horrible. The wiring kit is a mess for anybody who doesn't have a PhD in electrical engineering. Also, the wiring harness was too short for me to run the switch into the cab of my xterra, and required cutting, soldering, and heat shrinking additional lengths of wire.
2) Aluminum mounting brackets are flimsy and cheap. They bend way too easily and don't take impact very well.
3) it's been one month, and my light bar already has water condensation in the lens. I've only been through one car wash and one rainstorm. Unacceptable water leakage.

That said, the light still works and produces a pretty good beam. For less than $50 total it's not a bad deal-- just beware of the above problems.