Luminosity as expected strong enough to be seen, but not strong enough himself to see, that is the way is not worth calling illuminated.
Processing is sufficient, but this is not worth call with the simple construction.
Functionality is good: Very small and light and fit in your pocket, mounted in 15 seconds.
BUT: Battery power is weak! The expensive button batteries suck in "stand-by" mode, ie when the normal contact with the battery is, without the light is turned on, a lot of power and my "white light", ie the batteries of the white light is / are after a few uses empty.
Although I have read in any comment, the batteries are not interchangeable, but this is not true. Housing can be opened easily, so batteries can be changed.
Conclusion: 5 is any defect which does not preclude the use, to cope with and if you will only be seen and you do not depend on the bicycle light as a guide, a purchase is recommended!
