The light has a great form factor, and daytime/night time visibility are both excellent. It's crazy how bright it is. The only issue is that It's difficult to keep pointed in the correct direction when mounted to an aero seatpost (Giant TCR, in this case). I have to tighten the strap to a nearly-impossible-to-achieve level to keep it from slipping. Once it's on though, all good. They could easily revise the shape/material of the mounting surface to address this in future models.