My wife brought me a present from Japan, admittedly one I asked for:
The Japanese on the packaging is about how this unit is wonderfully light, bright, quiet, and has low rolling resistance.
My inaccurate postal scale puts it at 8-9 oz. It has 4 LED's - three are for the main light, the fourth is a yellow blinky standlight visible from the side as well:
Just rolling it back and forth with my hand it seems to live up to the hype on the packaging - it is very smooth, quiet, low resistance and at that speed clearly lights up a darkened room. Ten seconds of rolling or so gets the blinky standlight going for at least a minute or two.
The big question now is how to mount this on a bike with cantis and Nitto M12 mini-rack.
The dynamo unit has to contact the front wheel ahead of the rack strut, which means the whole unit has to go in front of the strut. The light portion can be adjusted up and down.
I'm a little concerned about having something cantilevered way out front like that, esp. since I routinely ride on unpaved roads/paths.
I foresee an afternoon of hacking around with an old union bottle dynamo mount designed for rear chainstay position that I have around. The light unit is easily separable from the dynamo unit, so I could mount the light in the strut mount and then have a little more latitude in mounting the dynamo.