Great headlight, I had to buy a second
I purchased my first one of these after owning a 54cm wire Luxos U. I changed my bike setup a bit, and put a long front rack on it. The original 54cm cable wasn't long enough to reach the handlebars, so I decided to put that light on a different bicycle and pick up one of these 95cm wire versions.
After ~2 years of constant use, I accidentally slammed my wagon's trunk on my poor 95cm wire version, breaking the housing and cracking the lens. I decided to replace it with another Luxos U, since I like the light so much.
Check out the Peter White Cycles reviews of this light. It puts out a very wide beam. When aimed correctly, it provides great lighting a distance, great lighting up close, and is really nice in that you can see things on the side of the road (pedestrians, deer, bears...). The USB charging feature is also sufficient to put some juice into my Garmin 520 bike computer on long rides, even with the headlight on.
When choosing a hub, you'll probably want to go with the SON 28 -- the slightly lighter SON Deluxe may not put out enough current to use this light and charge a USB gadget at the same time.