[White] I loved the E01 v1 and now love the V2. I didn't want a complicated light with lots of modes at the expense of complexity and a shorter battery life, but this is where the V2 shines. If you want to use it just like the V1, you can. If you twist it on, you initially get the 5 lumen mode and it lasts 25 hours on that mode, which is better than the 19 hours for the V1. In order to access the other brighter modes (which admittedly are definitely useful sometimes) you have to twist the cap again within 1 second. Otherwise, you get the 5 lumen mode until you twist it off. That lets you use it just like the V1 (with better battery life) unless you intentionally multi-twist it to get the higher output modes. That's the best of both worlds!

[White] This light is all it is said to be. The main reason I chose this light is that it clips on to the brim of a ball cap and acts as a head lamp with out having all the strapping.

[White] Great flashlight , the perfect size and weight .
Sits comfortably in the pen pocket inside my bag
Easy to operate Very basic funtions. Four modes and that's it
Highly recommended

[White] It does run for about 25 hours, I have tested it (indoors) for about 23 hours and it is still going in fact it seems brighter than the one with a new battery but that can't be. It still can turn to a brighter setting, but not surprisingly it isn't as bright as the one with a new battery (see pictures).

It is fairly easy to operate, just twist on. Once on just twist on/off quickly to increase from 5 lumens to 25 lumens, and repeat to progress to 100 lumens. I find holding by the top and twisting with the bottom hand keeps my hand out of the light so I can see when it is off/on. [Not sure about one handed operation. If you tighten it just before it turns on, I can turn it on between my thumb and finger, with it nested in a fist like grip with my other fingers, with more effort I can turn it so it stays on. I usually unscrew it quite a bit to prevent drain, not sure that helps. But one handed would not be worth the bother, if this is what they mean.]

It can roll off a table it not attached to something, and the hole to attach it to something is very small, I think it comes with a wire ring though to put on it, or those camera straps with a final wire like ending will fit (what I am using right now)

I like the brightness levels and run times , but that varies by use/person. It is a bit bigger and heavier the rechargeable Nitecore I also bought, so by weight anyway a couple of those might beat out this one, or recharging it on a brick. This is about 1 oz with the battery and the Nitecore is 1/3 of an oz so not that much for either.

I have owned this for a couple of weeks so . . .

(I decided to test the runtime after thinking the lumens were not as bright as others but I think I was wrong about that, but I did do the test and took photos after each 5 hours of use, but the comparison at 23 hours (not dead yet) and new is probably the most meaningful)

[Polycarbonate] I bought this to replace a lost Surefire Titan Plus. Not quite as slim, but the 4x higher lumen rating, lockable switch, battery indicator, and the USB-C rechargeable battery are great to have. My only quibble so far is that the charging port cover can be hard to open if it has been pushed down into the flashlight body. Otherwise, perfect for me.

[Polycarbonate] High light power.
Wide power options

[White] Im not sure what tech Fenix uses, but this seems far brighter on the max setting than any other light this size I have seen. I like the various methods of turning it on and setting intensity, it is impossible to light it up by mistake and kill your battery. So small and light it is practically unnoticeable as a carry.