I have two Cyos [a 40 Lux & a 60 Lux one] and the Philips Saferide 60 Lux hub dynamo driven light on my bikes. All three are very comparable. None have given me any trouble. Worst thing I can say about any of them is that the Philips can be difficult to mount -- it has to fit on the fork crown, and even then it doesn't always fit because of the size of the headset already there.

The light beam of the Philips is the widest of the three -- which is especially nice when you ride on a lot on narrow roads, or roads surrounded by trees.

To my mind, so fully subjectively, the 60 Lux Cyo is the one with the most light though. It has been the only light as well that made cars slow down when they came towards me. Though this could indicate as well the light beam easily could become bothersome for other traffic. Just a slight upward tilt makes it blinding.