I have two of these I clip to a tech ball cap while running in the winter. Headlamps hurt my head and two of these provide enough light for me to see the road. I also have trouble with nausea with moving light and somehow these are a sweet spot for me (bright enough but not too bright). I've had mine two years and they are great in the winter when it's dark early. They are also higher quality than many similar (e.g. dog) lights.
My bro in law loves this light I gave him for Christmas, he always wears a baseball hat and this clips on easily and securely