FWIW, I have the Luxos U ( with the USB option ) and it's a VERY nice light. The beam pattern is great for seeing around corners when you come to an intersection, etc. And the USB option is great for keeping my phone/GPS/etc charged on all-day rides.

The only notable downside ( beside the price ) is that there are incompatibilities with some taillights, and it won't work properly with lights grounded to the frame, so you can't use the single-wire setup common on many bikes. In my case, I disassembled my Seculite taillight to eliminate the ground lug, and then it worked fine with coax cable.