So far, I'm sorry to say that I'm not quite catching what the great appeal of this light is. Please enLIGHTen me, those who get their lights first...
A lot to do with it size/output and run times.
Will start with size, the 26650 form has a real nice comfy form factor, little wider than the 18650 form so it helps with heat dissipation due to a little more mass.
Output, well xhp50 or xhp70 are monster LED's, high output and good for 3000lm in this light, of past normally the larger 4 x 18650 cell type for this output, yet now in a pocket-able size!
Run times, as most 18650's (INR here as we are on vinh lights) tend to be 2500-3000mah and maybe 20a(more than enough and just an example), 26650 cells are roughly twice the capacity(but not twice the size), so benefits of longer run times...........
The olight as a brand, they are nicely made, decent ano and have a quality feel to them!
So all in all, its a pretty decent package and a useful beam, no crazy tight beam here, but a nice hot spot and generous spill which covers most general uses and some. It could be a work light, a glove box light, a compact S&R light............so potentially many uses.
Then just to add to the flexibility, you get a USB charge option thrown in, no charger needed or out and about you can plug into aux socket or even a laptop USB.........charge anywhere on the go, if/when required.
Finally vinh is offering lots of tint options, dome on or off, this helps the buyer to tweak his/hers desired output/tint/throw of their preference.
Thats my take on this light anyway..........