I've been very happy with all of the Sigma Sport products I have owned. Your products are an excellent value for their cost. Sadly I have stopped buying your LED lights as they don't have a flashing function.
It looks like you make some nice high powered lights such as the Karma, PowerLED, and Kalmit, but none of them offer a flash mode which so many cyclists use every day. Why has this vital function been left out of your lights?