Give this light a hard first outing, an all night bike ride with some fast descents and heavy rain. The light worked perfectly, and still had more than 50% charge remaining at the end. The lowest setting is ideal for group riding on the road, and I only needed 1 level brighter on descents. The only minor fault is the head band, which appears to have a plastic base designed for helmet mounting but with an long strap. The base holds the light at the wrong angle unless you wear it like a bonnet. Not a problem for my purposes, but not ideal if you want a head lamp.