I have are only a couple of weeks, so I can only judge them on their practical functions. The assembly was a bit difficult because I have a MTB, cables were laid quickly and the button is thanks to the included rubber rings easily. Even at very low speed it is lit extremely strongly. Charging my iPhone 5 is very limited when the front headlights and 90Lux it no longer charging. Is off the lights, my phone to airplane mode and I drive about 20-25km / h, my phone invites as a regular power outlet. When using Navigation, very bright display and about 20km / h the battery will no discharges, but also increases by about 15% / h.
because you can not always ride invites its devices at each, I recommend everyone to buy an external battery to the one aufladet permanently. The then supplies all devices, even away from the bike.
109,90 I just paid and I think it has now more than worth it! Electricity costs are thus gesparrt ecologically.