I've had my Knog PWR light for a few months now. I appreciate the quick and secure engagement system. The light feels and has been secure, whether I'm on the road or bouncing on trails. It creates a powerful beam, enabling me to hit single track after dark. Adjustment of brightness is easy, with a quick quarter rotation of the head of the unit. Features a strobe, if you just want to be seen. I have not pushed the limit to see how long the beam lasts on high, nor have I used the power bank feature. That said, I am very happy with this light, thus far.