I bought one of these lights two and a half years ago, and together with some rechargeable Duracell batteries, it never let me down. The bracket was a different matter and I've got through roughly one a year. The second failed me this past week, prompting the light to fall off, at which point it got run over by a car (rather the light than me). But while the lens and LED chunk of the light became a very complicated jigsaw, I didn't expect to find the body, with batteries tucked inside, still intact! Tough little thing.
I thought I'd use its demise to upgrade slightly. Maybe that 25lux light was special, but the 35lux version I bought is rubbish in comparison! Yellower light, narrower beam, nowhere near as good at (a) showing up pigeons on dimly lit bike paths, or (b) alerting the pigeons to the fact that the light is coming for them.
So I've gone back to this model.
The new Smart brackets are supposedly suitable for all handlebar mounts - not quite. No matter how tightly you adjust them, they'll slip. Find some rubber shim stuff from another brackety thing (my D-lock mounts seem to come with a tonne of the stuff), cut a couple of slivers long enough to go halfway around your bars, then tighten the bracket over those to stop it rotating like a disco light every time you go over the slightest bump.
You can't ride unlit roads or tracks with this light, but for the price you shouldn't expect to. Use it with a flashy little LED and you'll be plenty lit up for city and dim light conditions.
Four, not five, stars because of the bracket.