So far these have worked great. My commute is app. 45 minutes and I have been charging them app. once a week since the days have gotten shorter. Would estimate about 3 hours total running time on flashing mode. They are bright and I have not had any cars pull out in front of me on side streets since using them. Little concerned about the longevity of the elastic bands used to secure them to my bike frame. That's about the only thing that I would consider redesigning with these. They have addressed a longtime concern of mine to be visible from the side while riding at night.
Great for being seen. Needs to be charged before every night ride because It loses battery life when not being used. I found roughly 2-4 hours of life on strobe compared to 6 hour claim. My other Blackburn products have significantly longer battery life than advertised.
I ride with these every day. I do not do night riding. These lights work well and last for at least 4 hours. They really increase visibility. For those who ride on streets and bike lanes anything that increases visibility is good. When you ride in shadows or on cloudy days they really increase visibility. I am sure they would be essential if you ride after dark.