Just swapped out the Cyo on my Gazelle with a Luxos U and thought I'd share the differences.
The Cyo achieves full brightness quicker, but its deceptive because the Luxos progressive lighting starts out brighter in the near field, and gradually becomes brighter in the distance as speed increases.
At speeds over 10 mph I can't tell the difference in brightness between the two when the Luxos is on low, when the high beam is activated the Luxos is noticeably brighter than the Cyo, not a huge difference, but definitely improves surface definition, and isn't washed out by oncoming headlights. The daytime running lights seem to be about the same as the Cyo.
The Luxos spread of light is a lot wider than the Cyo, at nearly 90 deg., it really improves the field of view in curves and turns. It has the sharp cutoff like the Cyo, but has more spill above the cutoff making road signs clearly visible. The high beam sends even more light over the cutoff, but not like an off road flood light.
The remote switch is really convenient, allowing one to easily turn the light on and off, and toggle between high and low beam, the rear light monitor lamp is a nice feature that lets one know their tail light is working. the remote also allows one to turn the stand light up to full brightness when stopped, or flash the high beam in daylight when its in daytime running light mode.
I haven't used the USB charging function yet, when I get a mount I will see how well it keeps my phone charged while running the GPS app.
Overall I'm really pleased with it, and at $150 from Holland bike shop with shipping, its a good value. http://en.hollandbikeshop.com/bicycl...u-auto-sensor/