I have the modified version from Vinhnguyen54 and absolutely love it. It instantly became my edc.
Side switch is awesome, I've had it underwater numerous times, and it's held up flawlessly. It's got a great beam profile, that's nice and throwy. And it's the smallest 18650 light I've ever handled. It's the same size as the V11R with AA extention.
Because of that, it runs for ages. The low voltage indicator is also great feature.
I couldn't recommend it more. You won't be disappointed at all.
The c20cvn is 1300lm. Vn= modified. Current boosted and dedomed led.