OOPS, I made one major mistake. It's a dual CR123 light, but not a dual RCR123 light like I said it was.
I can't expect it to last forever, but I've had my Xeno e03 and use it almost every day and the anodization is still good enough to lock it out. I want the threads on the S10 to do as well or better.
The cost depends on how you value what the S20 offers. If the side clickie and UI don't mean a lot to you, then this light is a poor choice. As far as the thin body, it results in a lower weight, which I find desirable. For me, that puts this light high on my radar, and the pricing is competitive.
The guys in this thread have pulled it apart and didn't say anything awful about the heat path or the pill, which tells me that it's at least acceptable. Bad designs like hollow and floating pills usually get brought up and trumpeted around here. There is a significant about of sag in the first few minutes, but output stays flat after the initial sag.
https://budgetlightforum.com/t/-/17212
Other than some people here not liking the tint, which is confirmed in this review from a website with terrible moderators & staff, this review seems good.
Would I personally buy a S20? No. That's because I'm an anything-but-18650 kind of flashoholic unless I get a ZL H600.