Top notch light for making you visible on your bike. It gives out enough light to show where you are but isn't for ridding on unlit roads.
I got my first one two years ago. I used it for over 500 hours of cycling before it gave up and stopped charging. However Blackburn offer a lifetime guarantee so I got it replaced.
Charging off USB is a different mind-set to using batteries. It no longer matters if the light burns brightly but only for 120 mins. For commuting it is so simple to take it off the bike/helmet walk to my desk and drop onto the USB charger every day.
The Velcro strap works surprisingly very well. I was expecting it to slip in the wet or over potholes but the light stays where you point it (even better than some solid bracket mounted lights).