Veeeeeeerrrrrryyyyyy interesting!
T1 light for 4+ hours! That sounds like a perfect recipie for someone who's actually USING the light as a duty light. We all like the super-bright, flashy stuff, but in real-world use, especially if 123's are hard to come by, a somewhat dimmer light that runs several hours in regulation can be a real winner. I'd say that one of these lights would be just about perfect for our troops - near indestructible (though I assume no HAIII at that price point), decent light, long runtime, big enough to not loose, true momentary-on tailcap, and all at $18.
Seems like a HUGE winner of a product to me, even if our flashaholic bretheren scoff at the brightness.