I did this on my own and absolutely love it. I recently put in a Nichia 291B from Bob McBob and it is beautiful. I carry it around every day and still flash it on in dark places just to enjoy it. My comments are:
If you carry it in your pocket without lockout, it will turn on. Fried my thigh more than once. A deep carry clip (not shown) solves that problem. They should include one.
Carrying it a lot makes it look beat up, as you can see in the picture. I doubt Sofirn will want to do this but a stainless steel bezel or insert will keep it looking good longer.
The Nichia emitter gives a ring with the smooth reflector (note Sofirn comment about the SST). I get around this by using a diffuser from a laptop screen (or you could use DC Fix).
I like Sofirn lights in general but I just think this is kind of long for an 18350 light. Compared to the Thrunite T1, which has built-in usb micro recharge, this looks like a big light. I wouldn’t mind this size if it had USB recharge but without, it just seems the reduction in size is not worth the reduction in battery capacity.
It is long. I wish it were shorter. It also costs about half of what the light you mentioned costs. You pick what you like. What I like about it is if you leave it in ramping mode, it’s click on, click off and a reasonably good ramp. Button light gives you a battery check. It’s not Anduril but good for carrying around and not worrying if you lose it or it breaks. Oh, and it does need a magnet in the tail.
I’m not claiming that it is so in your particular case, but many times a ring from a smooth reflector is not caused by the led itself but by a slight defocus. Paying attention a proper focus, maybe sanding a bit off the bottom of the centering piece, maybe use a different piece with a different height, can maybe make the ring disappear?
Since using the White Flat, I have focused ( ) more and more on getting the focus of leds right in my builds, not just of speciality leds like the White Flat but all of them. Getting the focus of a led right in all 3 dimensions is a pain and an art, and the resulting beam is highly satisfying for a flashoholic.