Got this as a gift for my aunt and she loves it! Told me the light is pretty bright and is great when she is riding during the late evening hours! I also like how Knog comes with two bands one for thicker handlebars and another band for thinner handlebars. It fits a 25.4mm handlebar with no issue. I think it can even fit my 30.4 mm MTB handlebar too but haven't tried.
I decided to add a front light for riding, not to see but to be seen. The Knog Plug front light is light, very bright, quick to mount and dismount, and has a micro USB port for recharging. Of course, it has a variety of modes - I use one of the flasher modes which is very effective and has the longest battery life (though I have yet to run out of juice even on multi-hour rides).
One minor reservation is the silicon loop used to secure the light. While it is quick and effective, the light can move a bit when going over rough pavement
I enjoy using this light. It provides adequate and I can usually get 8-10 hours per charge.
I do have a complaint: I was riding in a cycling event. It was a damp morning to start out. I had to ride through a steady rain that last 45- 60 minutes. Even after trying to charge the light, the light would not work. I liked the light enough that I will try another one.