Positives:
Good luminosity
Batteries
Great lighting for the price.
Neutral:
Hardly any difference between Eco and Normal mode. A larger gradation would have been great
Negatives:
The plastic screw for fastening is so cheap that's happened to me flutes equal to mount this on the first try the lamp on my handlebars. Did it then with a larger screwdriver, a lighter (for melting the screw puller) and a hammer made the lamp yet to fix. But a clean dismantling is not possible anymore. A spare screw would be useful at this cheap quality in delivery.
For the price but strong buy recommendation.