Convenient to carry, attach, and move from bike to bike. Not as visible as something like the Plant Bike Superflash, but certainly bright enough to be seen in the rain or at night. Almost irritating to my riding buddies in my draft, but that tells me that it's working (and a signal for them to take their pulls). It seems a little loose on the narrow seat stays of my older, steel, Lemond frame, but it stays put. Definitely more secure than a standard blinkie clipped to a seatbag loop. What it lacks in output, it makes up for in convenience.