Hope you don't mind my two cents about the WF-C6S.
I have one of these too and I have to admit, I bought it for the bling factor. I think it's too heavy in relation to its size to serve as an edc but it really "shines" at more formal occasions.
Can confirm that it has no donut hole (at least my sample from DX).
Current draw in "high" from a fresh CR123A (open voltage 3.28V) is 1.12A and from a used one (ov 2.91V) 1.24A, The eye-metered brightness is about the same, so there seems to exist some proper regulation.
Draw in "low" is 0.12A from either battery and the brightness is very useful. Unfortunately it has visible PWM flicker when in movement.
Memory works well, coming back to the same mode used for >1s before you turned it off.
I believe the light is made of chrome plated brass, not bronze, but then I have no way to tell. My sample came with a pin point sized flaw in the plating and I wonder if that's the spot where the chrome will eventually start to come off, but apart from that it had no faults at all.
Despite the PWM issue and the strobe (which on the other hand may makes it an even better party light) I like it.