Very bright, good battery life, but fiddly
Brighter than expected - very visible day or night. Good range of light modes and good battery life (easily rechargeable via USB). Appears solid and well-made. The seatpost bracket connection seems quite sensitive (i.e. the light position can bounce around rather than being more rigidly-set), almost like a screw needs tightening somewhere, but this is probably a minor fixable issue.