I think I have had it for 8 years.
Always on my keys.
I randomly remember buying it at the supermarket.
One of the 4 screws is missing, it unscrewed on its own.
It doesn't affect it.
The plastic button has started to melt after all these years. (It's like the material sticks to your finger when you press it)
I haven't needed to change the battery yet... I have used it just enough to see a lock in the dark, something that may have fallen, etc.
Value for money

The only negative thing is that you have to hold the button, but this can also be considered positive as you don't have to worry about leaving it open, etc

Strong light - very good quality-price ratio. The only negative is that when you press the button to turn on the light, your finger needs to be pressed. As soon as you release it from the button, the light goes off. It's not like on/off switches.