Bright but not long lasting.
580563
Light is very Bright at First.  However it does drain batter quickly and the light diminishes to a low quality flashlight after about 20 or 30 minutes of use.
1645769
I installed 12 of these in my motor home after buying them in spring 2015 - many of the individual cells began to go dark within a few week and shortly some whole bulbs were burned out.  Over the course of the summer, the RV did not get much use. On the fall trip, more of the individual cells burned out, so I finally replaced all of them with traditional 1156-base bright white Sylvania bulbs.  I will say that while they worked they were very bright and very white.  I will also say that they might not be suited for the rugged driving that RV's get and could be very good in other installations.
1146806
These are cute lights, and a lot brighter than what I expected.  My only gripe is that the strand isn't very long, so I'm going to have to buy a few more.  I'm using them to decorate my cubicle at work, and it's only long enough to string along the top of one side.

**EDIT**
I ended up buying the blue bats and purple spiders as well.  The pumpkins and bats lasted about a week till the lights died - it wasn't the batteries that died, it was the lights.  The spiders are still going, but they're nowhere near as bright as they were when I first bought them.  Huge waste of money.
1517071
They were easy to install and they look nice but they don't stay lit for long. I checked them in the early evening and they were nice and bright. By early morning they were off. So, did not do what I needed.
4079918
I like the light color and brightness.  One of 6 failed after 2 months.  With my limited usage they should last at least 10 years.
3799613
I like their brightness, but mine only lasted for 5 months. The Auto Zone guy said that's about normal for these lights. I'm going to look for a medium grade headlight that reviews say last longer.
769032
These bulbs are brighter than the original bulbs, but have a much shorter life.
These lasted in my car for about eleven months.
I will still be willing to purchase these again because I like how bright they are, brighter than the originals but not too bright to overwhelm other drivers.
115724
Super bright... Then 20 minutes later the batteries lose their voltage, LEDs dim down and the Blue LED doesnt have enough power to illuminate. Funny thing, though. They will flash super DIM for up to 4 days.... and i mean DIM. All rings did the same thing. Some lasted 10 minutes before dimming... others 30 minutes.
4225671
The lights are bright and a nice neutral white, but didn't last. Bought in August and the first bulb blew out in December, so I got 4 months max. I installed them carefully and used clean, nitrile gloves to make sure I didn't get any dirt or oils from my hands on them.
3111434
These looked great when we first put them out. They were very bright and heavy and felt like they would last. Unfortunately the batteries lasted less than a year. I'm hoping some new batteries will breathe some life into them. Luckily the batteries are very easy to change.
210249
Bright but one died after about 9 months and the other after a year.
526794
Super bright. A little disappointed that some of the individual LEDs burnt out after 1st camping trip. Very bright. Would not purchase again as not seem like will last very long.
553237
Handy size. Extremely bright over good distance when battery is fresh. The on/off switch is overly stiff. About six months into ownership it began doing funky things like dimming, flashing, going out completely. A few shakes sometimes helps. At least for a few seconds. It works great when it works, but unfortunately that nexus is becoming rare.
3784020
Very Bright but there is Moisture in the lights after only a few weeks.
391476
Very bright as advertised, but after only 17 months of operating as my high-mount 3rd brake light on my truck, began to flicker.  Replaced with Sylvania 921 LED.  We will see how long the others last as my backup and cargo lights.
1599036
Really great light and much improved downroad light, but they barely lasted a year before both going out at night.  Not happy with the super short lifespan.
1214539
I had these for about 10 months. I need to replace because one quit working. Not even a year of wear. Sad. But they were bright.