The light "mode" selection is nice but, the run time is SHORT. I use it on my commuter - about 4 hrs., however, I wouldn't use it on my road bike. It would go dead on a long ride and would have to charge it for every road ride.
My only suggestion to improve the light is to make the power button larger. It's a bit small when wearing gloves. On rides of 70 to 110 miles, I have been unable to drain the battery. On one step down from the brightest continuous light, bright enough for dark streets, the battery lasts 100 minutes.