LED Headlamp Test, Petzl and Black Diamond Win, by Wired Magazine
Wired’s Dome Lights review compares the Princeton Tec Eos, Petzl MYO XP, Black Diamond Vectra IQ, and Primus PrimeLite AR. The Black Diamond wins with 4.5 out of 5 squares and the brightest beam going. The runner up, for being only half as bright, is the Petzl MYO XP with a 3.5 of 5 rating. Since Wired is a tech-culture magazine there aren’t any brand-biases before they get the gear, but their testing was also only the basics (beam, brightness, & lens). No field-function or durability ratings by their techie-San Francisco reviewers. With the history of quality gear from Petzl and Black Diamond that’s probably not worth worrying about.
The $35-$90 prices are worth worrying about. LED headlamps can be had for half the price and with weaker beams they’re smaller and your camping partner doesn’t need to walk a mile from camp to find some privacy.