I have the Black Diamond Xenix. I haven't tried the others mentioned. It has been great. I use the lower wattage Led's on better streets and the higher output one for darker areas. I don't notice it after a minute or so.

One of the guys from Cal TEch made some helmet straps for his Xenix. Looked great.
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Maybe he's from JPL, I can't remember

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Dick

Take everything I say with a grain of salt. I know nothing.