Those are great little lights, but I don't like the fact that they only charge via USB. I'd at least like the option to charge via wall plug. I have an old Light & Motion system with a helmet mount tethered to a remote battery that can handle anything, but is inconvenient due to the remote battery. For city riding I'm fine with a Planet Bike Bike 2W 139 lumen AAA alkaline battery powered LED light on my handlebar. The batteries are cheap and last me a couple of months.