I have the last few weeks Roadster clamped to my city bike and am very happy with it. Man but they do not need with a Ixon, Pava or other expensive lamps comparisons have a different purpose, it is simply a lamp which is more than adequate for the city. For me it is almost every evening in use. For moderate mountain bike use outside of the city lights, I would still ok. For the price range, I find the feel and processing more than good. The battery / battery change happened without worry that breaks something, the mounting device on the handlebars is also a good solution. Ah yes, the lighting is truly uniform, no disturbing dark spots and sufficiently strong for the city use.
