It is regrettable:
Pressing the button (the lamp end) not super convenient because between between metal pins which are used to make up tarnish. So it is necessary that the thumb is well in the middle.
The focus of the lamp is not scalable, ie as on maglite able to adjust the type of lighting between a point of light or a wide and diffused light.
The change in power mode, turning the head of the lamp and button actions, make it not very practical or fluid. But we made it.
Finally
I rather regret the use ergonomics that could have been better and its high price.
This does not diminish its light output quality, low consumption, production quality.