Pros: Perfect size, as others have stated, the LED head is solid. Using a Ultrafire 123A lithium rechargeable (SKU 03204)I get about 1/3 more light than with a primary 123a.

Cons: There are only a few drawbacks to this light that I would change. 1 - I used my end mill to shave down the aluminum button on the bottom of the flashlight to accomodate the longer size of the Ultrafire 123A rechargeable, I didn't totally eliminate it, but shaved enough on it to fix the problem - with an ultrafire in it, the threads BARELY engaged the O ring seal, and the head would unscrew too easily. Once done, it had an extra 1.5 turns and fully engaged the seal - still works fine with a 123A primary cell too. 2. There is no spring used to keep the battery from moving about in the flashlight when not in use, I can understand WHY (simplicity of design) but I hate things that rattle around, and a battery that takes too much rattling can fail. The threads are too thin, and engage with a lot of material scraping away - making the flashlight body just 1 tenth of a millimeter thicker and you could have MUCH more robust threads. Application of lithium grease fixed this problem to some extent.

Other Thoughts: This flashlight has SO much potential, but not having a couple of design flaws addressed puts it in the "nice to have, but not to depend on" category for emergency use in the car or at work. So, while I LIKE it, it takes second place to the Cree SKU 06117, which is slightly larger - but, surprisingly, puts out a little less light than this one.

Bottomline: I don't regret buying it, but wish it weren't so flimsy in the thread department.

Pros: -One of the smallest yet powerful flashlights
-Very Bright
-Good battery life

Cons: -Lanyard hole a little small
-Should have a Q5!!
-Not cheap but not too expensive either
-Light is very white with a little hint of blue compared with my Fenix P3D Premium 100

Other Thoughts: This flashlight is small yet very very powerfull, is really bright, after a couple of minutes of use it gets hot, not enough to burn but hot.
My worked just fine upon delivery.
It looks very solid, has a glass lens which is nice and is small enough to be in my keyring, nice EDC.

Bottomline: Just bought another one for a friend, it is so nice.

Pros: VERY small and very bright. Seems durable enough, and looks like it would be very water resistant. Only takes one battery and with rechargeable, would be cheap to run. Very cheap and reasonable for what it is.

Cons: I don't like it that you have to twist it on and off from the front. Would be better if it had a small clicky or twist from the back. Not a big deal and i knew what i was getting, but that would make it a 5 star.

Other Thoughts: Going to carry this instead of my 6p now because of how small and cheap it is. I wont worry about loosing it, but it is about half as bright. Still not shabby at all.

Bottomline: It is tiny and very bright. Would recommend it.

Pros: Very bright, can even see it at sunlight.
Really small, doubt it could be made much smaller with this kind of battery.
Metalhousing and not plastic.
Appears to be a glass lens.
Great size to keep in the keychain.

Cons: Very bright, tends to get warm quickly, but cools quickly once turned off again.

Other Thoughts: Battery a bit loose when turned Off, but seems ok anyway even if it rattles a littlebit.

Bottomline: Really a great flashlight for its size for those moments its not needed to be turned on for a long period of time.