They do rock, however there is a perpetual problem I see with everyday headlamps such as the ones made by Petzl, Streamlight, Princeton, Ray-o-vac, etc.

They can't be used with hard hats (safety helmets)!

I see my search & rescue collegues using zip-ties and all sorts of fragile setups to attach their Petzls to their hard hat... <img src="/images/graemlins/mad.gif" alt="" />