Headlamps: Petzl Duo LED vs Black Diamond Gemini

[Josh Wilson]

I am looking at combination Halogen/LED headlamps for camping and hiking use. The two that seem to get the best reviews are the Petzl DuoLED (for $66) and the Black Diamond Gemini (for $38).

Can anyone share their experiences in terms of weight, battery life, robustness and general usefulness?

Thanks