I have been using them intermittently since the version 1 and this version 2 is nothing but unique and awesome. But that doesn’t mean it doesn’t have flaws. I’m a long distance runner and i train all year round in nyc. Although there aren’t that many dark patches but i run before dawn and this helps to keep you feel safe and i got plenty of compliments along the way. However, the issue is the mechanic/design of the product in which the head of the unit will get loose and eventually drops to the lowest setting (on the mount) so on the shoe it will be pointing towards the ground. I often have to stop and clock it back upward to face to the 9 o’clock position but it keeps dropping to 7 o’clock angle which is not fun to have. I have contacted them about this and customer service was excellent and they replaced it for me but it happened to the replacement one as well so it wasn’t a faulty unit, more like the design fault. So I’m hoping the 3rd generation will fix this issue because it is practically unusable if you are wearing it for running. The pounding on the pavement will quickly loosen the head mounting position and you no longer have the light to light up the path.