Just checked my WT90 and the LED glows very, very slightly. I removed the reflector and it still glows. I cleaned up as much as I could around the emitter (obviously can’t get under it without reflowing), and it still glows. Hoping someone wants to try reflowing their emitter cause I’d hate to desolder the emitter leads again for no reason…
@Tom E, what do you mean by resistor bank? I’m only familiar with the TA driver topology published here: https://budgetlightforum.com/t/-/41018
Some minor thoughts on the design and machining which are not complaints:
- It’s sharp, yet a bit slippery without any knurling. I know it’s unfinished and raw anodized, and I understood what I was getting into. Still, I found myself filing down some of the sharper corners and edges.
- I wish more flashlight makers indexed their body tube threads to align logos consistently. The Wildtrail name on mine is on the side and a little toward the back.
- Tactile rubber e-switch with press-fit rings like those offered by Emisar/Noctigon feel a bit more quality/satisfying than the WT90’s.
- The scalloped portion of the heat sink fins is very attractive. Art deco vibes.
- The middle pillar of the tail is shorter than the three legs. I think having it the same length would make tail standing more stable in most scenarios (maybe there’s some advantage of a shorter pillar for compliant surfaces?).
- I think the cell carrier should have some sort of emergency access hole at the top in case it gets jammed into the body. Imagine a bit of dirt getting into the gap.
Final update on the fake P42As: The seller told me their supplier “accidentally mixed in some sample cells with their order” 
. I’m keeping the cells (it is technically illegal to traffic counterfeit goods) and getting a refund. However, my MC3000 tells me that the cells’ discharge curves are spot-on compared to results from HKJ’s tests. Internal resistance is ~10 mOhm higher than nominal, but I’m not sure if it’s statistically significant. Bottom line is to stick to trusted battery vendors unless you’re willing to do deal with the potential trouble.