Haven't heard of it til now. Does look pretty neat, and possibly better alternative than the Petzl light.

Trying to think of alternatives... and closest is the Manker E02 II in terms of price/size/weight. 1xAAA but no red/SOS and have to get headband seperately.

http://www.mankerlight.com/manker-e02-ii-ultra-compact-pocket-edc-flashlight/

The Manker E03H is its 1xAA version.

Then there is Acebeam H40 and Thrunite TH20 which aren't angle lights so less flexible.

The above alternatives probably fail on ease of use too compared the Black Diamond too.