The build quality is great. The rubber cover for the charging port inserts deep into the port, protecting it. I like the strobe mode: it's not hysterical; just right to announce your presence. I haven't measured it, but the battery life is certainly less compared to other lights I've on my bike.
The lights are bright and sturdy in build. Must have if you use your bike to commute in a city.
I live in an area where it is normal to have dense fog in the mornings for atleast five months in a year. I mount these lights on the forks which makes me visible during even thick fog.
I have been using these lights since 3 months now. Very innovative and on of its kind. Give your bike a really upmarket look. It has four modes, 2 steady and 2 strobe. Only one feedback to blackburn that the power button is too very hard. Rest the build quality is top notch....no matter what you throw at them like tree branches or any flora or fauna while trail riding, they will last....