I got 4 used ones from the local market the day before yesterday. I have already given 2 pieces, I will keep 2 for myself. Quite pleasant light at night considering its purpose it is well thought out - it does not destroy night vision. At first I didn't like that it was necessary to make 1 full rotation of the head in order to focus the beam to a point, but at night I realized why this was necessary. At first we see a large hole in the ray, but this is when our vision has not adapted to the darkness, so it can be somewhat annoying. In complete darkness, or when you wake up and turn it on, this very hole does not irritate your eyes and you can see enough, then you can calmly focus beam when you need it.
I checked, it works on my eneloop lite AAA for about 50 minutes, then I stop, because the light is too dim.
All these irregularities in the beam do not bother at all, much more unpleasant - changes in the color temperature over the beam cross section in LEDs