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I have a bunch from when they originally came out. Admittedly I haven't used it for a whole lot (but I haven't really done much production work in a while either.)
I also have an Ulanzi one. It gets nowhere near as bright, not waterproof, no slave mode, or bluetooth control. But it was cheap, so I carry that around and use it as a flashlight, and if it breaks, then whatever. It's cheap (I actually got it for free.)