Yes, they are dimmable but just a little bit ...
593812
Yes, they are dimmable but just a little bit.  Will not dim anywhere close to a normal light bulb.  The lowest I could go without it flickering was 70% brightness. Returning these.
977815
These aren't 100% blackout, but they dim the room quite well for them to be what we needed for our kids room.
977752
They're dim but still nice. They look more like faraway stars than lights. The solar panel and battery are effective so far.
2087819
The lights are ok if there is zero ambient light; however, if there is not total darkness they are very dim.
1405971
We bought these as an adjunct to a concert.  They all energized just fine.  BUT they are VERY dim.  In an evening or totally darkened setting they would likely be OK.
3454108
These are just a bit dimmer then ones I bought at Michael's craft store but the battery pack is small and easy to hide in a vase. These don't have a timer so they stay on all night until you turn them off. I like that because the ones from the craft storeturned off after 4 hours and you have to remember to turn them on.
3162139
These are great.  I love the dimming feature.  Hopefully they stand up to time.
759169
These bulbs work great, in one setting.  They light up no problem and like any light bulb are easy to insert or replace.

However, these are dimmable. This is fine, it means it works well with a dimmer which I do have. But they do not dim! They turn on or off, and they don't flash when off like most LED lights that are not dimmable, so it is usable, but they do not adjust their light settings.  I reduce the power, the light is the same.  Reduce more, same.  And more...same.  When I am finally down to 50% it drops a touch.....very slightly, but you can see the difference at that point.  Literally, 60% is full blast and 50% is just under full blast....about 95% luminosity. Drop it down to 20% and it drops another notch, maybe 90% of it's maximum luminosity. Then 10%, no change, and off....where it shuts off. So I can have it at Off, 90, 95, or 100% power when it should light up at Off, 10, 20, 30, 40, 50, 60, 70, 80, 90, and 100%

So, I purchased dimmable lights, only to get lights that work with a dimmer but do not actually dim.
3490395
I wish they were just a tiny bit brighter.
311243
They work... to a degree. They are not fully dimmable as other have mentioned. At the top end of the dimmer, it dims to maybe 80% and then all of a sudden it jumps down to 30% brightness. These are just rough estimates, but there is a huge non-dimmable gap in these.

Also, these are clearly listed as 4W bulbs. The packaging mine came in clearly state that they are 1W. So I definitely did not get what I paid for.
4229252
Only OK. I use these to add some color to the exterior of my home and while they DO work, they are very dim.
4230868
I finally got tired of buying cheap incandescent that didn't last too long at the hardware store and decided to look for an LED alternative.
After reviews on a regular non-dimming bulb I chose the dimmable.  On low light setting you can still see a subtle flicker that makes your eyes kind of dance, but on the high setting it works fine, so a little disappointed there as I thought dimmable would have avoided the flicker that the non-dimmable ones reported.
The light is pretty bright though, so no complaints there.
Changing out the light bulbs under the microwave is nowhere near my idea of fun, so if these can last a good while I'll be beyond thrilled lol.
1602629
Lights are nice, but I thought from description that they were dimmable.  I'm sure they will be fine, but I am very disappointed that we aren't able to dim them.
1649237
theres slight ghosting while the LEDs are supposed to be off but its very dim, other than that, they are bright and beautiful and the ghosting looks kinda cool anyways . would buy again.
3244151
These aren't as warm a light as I would've liked, and they flicker a tiny bit, but they're great otherwise.
4749477
I have four of these in ceiling cans. Compared to the incandescent lamps they replaced, they have a good color, perhaps slightly cooler but still a warm white; but a noticeably narrower beam. Still a flood, but not as broad a light. Having said that, I quite like the effect, as the lighting in the room seems 'lower' as most of the light is reflecting off the floor.
They do dim quite differently, I don't think you could mix them with regular lamps and expect good results, as they need a much lower dimmer setting for an equivalent brightness. And if you set the dimmer too low they start to flicker. Not sure if this is these bulbs, or the Insteon dimmer, but at about a 14% level they flicker off and on a few times a second.
Overall though I am happy.
2741435
These LED spots are an excellent value. They're not listed as "dimmable" but work just fine with a dimmer. You can see some flickering only if they're turned down extremely low. Under any other conditions, they look like standard incandescent/halogen lamps. The color temperature is a bit colder than a typical incandescent, but not my much - they're overall quite warm.