Powerful light, fascinating very accurate design, a lot of features. But the construction is not very reliable. The bail at the end of the light's clamp is very thin and easily broke after a week of riding. Also you have to be very careful when you thread the light's head. The O-rings on the light's body are very thin and the head has a very sharp v-shaped rim. If you slightly misalign the head when threading, the O-ring can be easily sliced apart.