Funnily enough, I like the extra thickness because the headlamp can throw glare onto glasses so moving it forward a quarter inch or so reduces this somewhat. Weightwise, I think it's a push versus three AAAs, and possibly even a weight savings compared to NiMH or alkaline.

Cheers,

Originally Posted By rionada
Thanks Rick,

It looks like the core adds some thickness to the light, but I am geeked out by the idea that I can program it to my liking.

I also like the zebralight h31 - it's lighter than the petzls and has multiple brightness settings that may compensate for it's lack of programmability.
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--Rick