Just installed the LightOn! headlight and am pleased with the design and light output. The headlamp is small and total light output is very good, much better than halogen Schmidt lights I got with the dyno. I have it installed with the tail lamp. The only criticism is that the light is a simple circular beam so that illumination down the road results in a lot of light spreading out above the roadway where it's wasted.
It would be nice if a design improvement was done with a lens that shaped the beam and provided cut-off. Moreover if that lens was rotatable you could then mount the headlamp in any configuration while still putting the light where it's most effective.
I like the easy removal method of the headlamp using thick elastic like the DiNotte lights.