You can never have enough lights on the road, if you ride on the streets or county roads occasionally like me. Especially nowadays, seems like we hear of accidents involved cyclist and cars just about every other day. I wasn't sure if this one last based on how it is mounted on the helmet, but after several rides, some very bumpy the light stay put! Ingenious!
It is bright enough for traffic to pay attention and solid enough so I don't have to worry about losing it. Good product.