Nice Light, but I'll be surprised if any of the 6 I bought last a year.
923203
These bulbs are great...while they last.  Good energy efficiency, nice bright light with good spread, but the idea that they will last "45,000+ rated hours (21 years with 3 hours/day 365 days)"  is a false one.  I purchased 6 of these bulbs for our kitchen 7 months ago, and 2 have already stopped working.  That's less longevity than a standard bulb for $2.

Edit: I contacted the Manufacturer and they credited me the price of the failing bulbs, with no hassle.  So great customer service on their end.  Hope the remaining bulbs last better.
3124616
These lights are wonderful. But they don't last.
I bought 3 of these. And within 6 months, one of the wireless receivers doesn't work. And one bulb doesn't fire very bright anymore. I have used them maybe 10 times.
835519
Very bright but they didn't even last a year. I bought two in June. The first failed in November, the second failed in January. I didn't expect them to last forever but not even a year is unacceptable.
4384801
I've had 5 of these in service for about a year now as outdoor lights. They run cool (or at least the outer case doesn't get that warm, and there's not a lot of warm air flowing out of of the vents, so I assume they're not getting all that hotwhich is a good sign for longevity), and they put out quite a bit of light.

How much? Well, they give me meaningful illumination (enough to not break my ankle, anyhow) out to about 250ft from the house. No complaints there.

QC seems a little spotty. I had one bulb fill up with water and die (so much for 'wet location rated') and one more that's filled up with gnats and bugs but hasn't failed yet. The rest are fine thus far. For what these bulbs retail for, I expect better than that. Unfortunately, there aren't really any good alternatives that I've found in the "extremely high output, rainproof, reflector-style bulb" market. On the up side, they have something like a 5 year(?) warranty. Sylvania doesn't want them back, though; the warranty terms say to return it to the place you bought it. So keep that in mind if you buy them from Amazon.
375866
This light will last only one year, as opposed to what is being advertised. Mine started to have its head thread come loose to the point of self-opening in the pocket, releasing all the tiny batteries. Yet, a tiny nice tool to have on your keychain. Light is alright, the clip is well designed and solid. But be prepared to buy another one in a year from now.
4708173
Significant improvement over stock bulbs with a nice white light.  Downside is that the lifespan is short.  Expect about 6 months out of these.  Still not bad for the price.  Buy 2 sets so that you have a back up set once the first ones blow out.
1867703
3rd Lamp, great light but electrical wiring fizzled after a year or so, will see how long this one will last.
2080519
Received this multi-color light June 16, 2015. It's different from the ones I purchased July thru Sep, 2013. This one has 5 small lights that change color, the others had 3 lights and are still working great (5 of them). The new one comes on at dusk a little earlier than the 2013's. This one is constructed a little different to get to the battery. After handle removal, you have to turn the top to unlock it from the base that the globe is attached to. I'm not sure how the base is attached to the globe, it seems to be sturdy. Other reviewers said their globes fell off of the base in high heat weather. Louisiana is now in the lower 90's and my globe has stayed intact. The on/off switch is made different also. It is a very small black lever (a little hard to see) on the side of the base that has the very small bulbs. The others had a sliding black switch (left-on, right-off) easily seen, below the 3 bulbs which are double/triple the size of the new one's bulbs. The new one quit working 06/29/15. After changing out the battery with a fully charged Moon Rays battery it still didn't come on. The On/Off switch is defective. The lights blinked a little when I turned the switch back and forth, then stayed off. I've changed my review of 1 week rating from 5 stars to 2 stars for bad quality control from manufacturer.
Thanks to Amazon's easy return policy, I'm sending it back for a refund. I might try ordering another one to see if I have better luck. Will update review if I do.
08/24/2015-Ordered 2 more, received 08/29/15, placed outside 08/31/15-One is still working 09/11/15. The other one worked 2-3 nights, I was outside those nights, noticed it was not on 09/08-11/15. The next day I opened it to change the battery with a NEW Moon Rays battery (excellent batteries, I buy them here at Amazon). I changed the battery but it still didn't come on. I noticed there was a black wire not connected, not sure if it became disconnected when I unscrewed the top. This NEW DESIGNED TOP is AWFUL! The battery is set in a hole in the top with a sticky sponge to hold the battery in place, with the electronics below the sponge. VERY CHEAP, AND VERY POORLY DESIGNED! Something a kid might think to do. The ones purchased in 2013 were designed VERY GOOD! They are STILL WORKING. With those the battery was incased in plastic case around it, you just had to slide it in. If the battery got loose all you had to do was stretch the spring out a little.
09/14/15-Bombay Electronics will accept the multi-color one back, BUT I HAVE TO PAY THE SHIPPING, which will cost at least $6-$8. I think if anything is DEFECTIVE within a month, a seller should accept the product back at their charge, not the customers. I just sent a reply e-mail to Bombay Electronics. They wanted to make sure I turned the switch to ON. I asked if they will be paying the return postage. They replied that day, that they issued a credit for the defective lamp and I did NOT have to send it back. I did not expect that quick of a response. EXCELLENT service from this seller. I changed my 1 star rating to 4 stars. As of today 09/30/15, the one I did keep is still working great.
This current design is POOR QUALITY. You might get LUCKY and get one that works, but then, not sure how LONG it will work.
I will update this review if the other one quits working. They ruined a good design. Maybe they will read my review and change the design back to the old style with 3 lights, the on-off switch set in the cover, and a solid inside cover with the battery incased inside plastic casing, not with the hole in the center where they place the battery on a sticky sponge!
The seller did ask me if I could send pictures of the 2013 style for their manufacturer, for their 2016 design, which I did. Hopefully they might make changes that are better, and as I suggested post pictures of inside the lamp so customers can see the new changes.
4229361
Just got these bulbs today, a few days earlier than originally told.  I like them so far as I purchased them for my dining room chandelier.  The lighting is soft and I think that it will be pleasant lighting for dinner.  I am planning to purchase some for my new foyer fixture as I'm about to replace that.  It is 9 bulb so I think that the combined wattage will be plenty bright.
I like that they are LED but am confused as the box says that it is a 1 year guarantee.  I thought LEDs were supposed to last many years.
420342
They're pretty bright, nice-looking, and they work with a pleasing light. What more could you want from a fancy lightbulb?

Except that 2 years later, two of the three bulbs are out. They are supposed to have a nearly 6 year continuous duty. We don't run them constantly, so this is pathetically shorter than the advertised lifespan.

I do not recommend them if you need more than about a year out of them continuous use.
4948973
These lights are actually brighter than the halogens they replaced, and a lot cooler, thus easier to handle.  However, one of the five has already burnt out after on a few months during which they were used only a few hours a week.  Luckily it is a 4 bulb fixture and there are 5 bulbs in the pack.
 If this is only a bad apple, then these are great.  I will update if any more burn out.
2934631
Awesome white light and very bright.  There is a lot of plastic where there is usually metal and glass on the halogen bulbs I'm replacing, but they have to deal with much more heat.  We'll see what kind of life span we'll get out of them but they are a great value if your looking for LED bulbs.

*UPDATE 8.21.16 - So it's been a little under a year and three of the original ten have burned out.  I've been leaving them on an average of 2 to 4 hours per day.  They start to blink off and on and then start to flicker before they go out completely which ends up being like a 3 day process.  I've updated my review to 3 stars from 5 because I really only got about 1000 hours of life from an LED bulb which is pretty low end.  Based on the flickering I'm assuming it's a component in the circuitry that's burning out rather than the LED itself, but still they were pretty cheap.
2057427
I want to really like this light, but after a year with it some fundamental flaws are apparent. Again, I do love the aesthetic of this light. Everything pretty much goes well until I had to replace the battery. The first or second time I did I broke a a wing off the only hard plastic piece. This piece  hold the rubber strap you wrap around your post. Thankfully it had enough left to keep my light attached most of the time. Now, after more than a year, ive torn the rubber housing, while replacing the battery. Hopefully there's enough tension to keep it on, but if it doesfall off I won't be too upset.

It has occurred to me that the light isn't quite angled right, as another poster said. It's either down angled a little or up angled a lot. I wasn't really that worried about it. I also thankfully haven't had any problems riding in the rain. I've been through some downpours, too. Perhaps the saddle sufficiently covers it.

Not sure I'd buy this again, but I did like it a lot for a while. A built in chargeable battery (USB?) and maybe a rubber shim for seatpost mount would go a long way.
2616110
Super bright but had one fail so far. Still have 6 left so we will see the failure rate out of ten.
4186148
One of my 6-pack burned out after just 1.5 years, and I didn't use that one at all for 4 of those 18 months.  I've had much longer average life span from CFL bulbs.
2749305
I obviously don't write down how much I use these bulbs - but I don't think that they last as long as advertised.  I leave them on almost all the time - only two of the six I purchased are still working.
3144732
They look good and put out a nice clean white light.  I can't give them a five because they are brand new and I have no idea how long they will last.