Can’t speak about the SF version, but the BLF348-219 has a huge caveat, if you ask me (or even if you don’t ). The threads used to screw the tube together are so hair-fine and easy to strip and/or cross-thread, that mine’s already almost a press-fit light.
The clip (unless you “rearrange” it as someone suggested to me, but too late), puts enough pressure to try to “bend” the pieces off-axis that you really have to hold them tightly and forcefully try to keep them coaxial while screwing them together. Otherwise, it’s Strip City.
Clean simple design (classy, as you say), beautiful Nichia goodness out the front, but extremely limited AAA runtime, and those damned fragile threads.
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For 5bux a pop (if the code’s still good), I’d recommend the Glaree (E03?) lights someone mentioned on the amazon-goodies thread.
The Orcatorch EA01 really impressed me, but I see it’s out of stock, and I don’t recall the “discount” price.
Astrolux A01 / Manker Boney, nice lights, but a bit over the ~10buk price-point. Avoid those with NMM.
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To me, AAA lights are really only better-than-nothing emergency lights, for situations like dropping something at night and trying to find it after it rolls under your car, or looking for something that fell on the floor in a movie theater, but not as an actual useful EDC light.
No idea how muggles feel about the subject, but that’s just my own observation/preference. I’d rather have at least an AA, or better yet an 18650, powering any EDC light. Then, when it’s SHTF time, I’d have decent runtime to actually use it.
With a keychain ring and the light itself, though, “normal” people might just love an AAA light.