Three or four of us in the local bike club got some of those vests, or vests pretty close to that last winter and tried them out on night rides and commuting. They work pretty well as far as visibility goes, but the durability leaves a bit to be desired. What I mean by that is that the wiring comes loose easily, leaving you in the dark. Battery life was okay... getting about a week to a week and a half's commuting out of a 9-volt battery.